Parthenogenesis Essay -- Asexual Reproduction, Honeybees

Parthenogenesis is a natural form of asexual reproduction found most commonly in lower organisms and plants. Sometimes known as virgin birth, parthenogenesis, involves the growth of an individual without fertilization. Discovered in the 18th century by naturalist and philosopher, Charles Bonnet, parthenogenesis is a progressive evolutionary strategy that some organisms have employed to maintain a colony. Just as there are benefits to organisms that utilize parthenogenesis, like reproduction without the need of male gametes, there are costs, such as a decrease in genetic variation. In the intricate eusocial organization of honeybees, there are three social classes –queen bee, worker bees and drone bees. The queen bee, as the name entails, holds the superior position in the colony. The queen bee lays all the eggs in the colony, being the only bee with a set of completely developed ovaries and having life-long fertility (Back Yard Beekeepers Association n.d.). After only one mating flight were the queen mates with a couple male drone bees, she stores the sperm to later fertilizes some of the eggs. The eggs that get fertilized develop into female worker bees and the eggs that develop without fertilization produce male drone bees. Due to the high maintenance of both the colony and its products, i.e. honey, most of the bees in a hive are female worker bees. These worker bees carry on a magnitude of different tasks, not including reproduction, which is reserved only for the queen. The male drone bees are reserved for mating with the queen bee. Following copula tion, the drone dies because of their barbed sex organ (Back Yard Beekeepers Association n.d.). Scientists have been puzzled at how this multifaceted organization is maintained bu... ...nd genetic factors play a part in sex-determination (Slobodchikoff and Daly 1971). However in some other hymenopterans, parthenogenesis occurs via thelytoky parthenogenesis. There is a subspecies of honeybee, the Cape bee (Apis mellifera capensis), which is known to exhibit thelytoky, the production of diploid females from unfertilized eggs, eliminating the paternal genome (Heimpel and de Boer 2008). In the case of the Cape bee, the queen bee determines whether the eggs are haploid or diploid (Oldroyd et al. 2008). By thelytoky parthenogenesis, the Cape queen be can produce clones of herself (Oldroyd et al. 2008). Undergoing a different form of parthenogenesis gives Cape bees the advantage of creating males that could mate with other queens (Oldroyd et al. 2008), involving one individual for reproduction, and a decrease in gene loss (Slobodchikoff and Daly 1971).

Macbeth : a tragic hero or bloody tyrant? Essay

Written by William Shakespeare probably in late 1606 or early 1607, Macbeth is considered by many people to be the darkest of Shakespeare’s works. The play is a tragedy about death and deceit amongst the Scottish noblemen. It focuses on the rise and fall of the main character, Macbeth. The argument on whether Macbeth is a tragic hero or a bloody tyrant still remains unsettled. In order to answer this question, we have to define the characteristics that make up a tragic hero. According to Dr. Peter A. Smith from the English department of Kentucky State University, a tragic hero possesses many several criteria. Firstly, the character must be of noble stature, meaning he is a man with outstanding quality. His actions must affect an excessive amount of people. Secondly, his downfall is the result of his tragic flaw or â€Å"hamartia†. However, the most common flaw is excessive pride or â€Å"hubris†. Thirdly, the hero’s decline is thew result of his own â€Å"free will†. Although â€Å"fate† has a very important part in the play, there is always a factor of choice portrays in the story. Fourthly, the audiences are usually left feeling that the hero’s misfortune is not wholly deserved. The fifth criterion is that the tragic hero will eventually realise what went wrong but it is too late to undo the harm. Lastly, after the death of a tragic hero, the audiences feel the cleansing of emotion or â€Å"catharsis†. On the other hand, a bloody tyrant can be identified as some one who is self-deceived, remorseless, unmerciful, and avaricious. The character should be of bad reputation and is generally disapproved by others. They should be lacking of consideration and sympathy for others. Also, they should exhibit a constant yearning for more and more power. Macbeth, at the different stage in the play, possesses many characteristics of both a tragic hero and a bloody tyrant. In the beginning of the play, Macbeth is portrayed as a brave warrior who has fought for King Duncan and has just won the battle. On his way back from his assignation as Thane of Glamis, he encountered the three witches who greeted him with many pleasant predictions. Their prophecies were the fact that triggered Macbeth’s ambitious soul. However, he was still seen as genuinely loyal to the King â€Å"The service and the loyalty I owe, †¦Are to your throne and state†¦ Which do but what they should by doing everything Safe toward your love and honour.† (Act 1: Scene 4: L 22-27) He already appeared to fit the criterion of tragic hero since he was courageous and respected. He has saves Scotland and many lives from the battle. After Duncan had announced that his son, Malcolm, would succeed to the throne, we first learned of his flawed personality. â€Å"Stars, hide your fires, Let not light see my black and deep desires,† (Act 1: Scene 4: L.50-51) He was asking the stars not to shine because the light would make others see his dark desire. He did not want anyone to know about his future evil plan. So far, Macbeth’s character still corresponded to the characteristics of a tragic hero. We must see how his character developed. In the next scene, Macbeth met his wife, Lady Macbeth, who appeared to have thoroughly planned out Duncan’s murder. She encouraged her husband to eliminate Duncan so that Macbeth, in the near future, would be entitled the king of Scotland. However, Macbeth’s conscience was troubled. â€Å"†¦Besides, this Duncan†¦, hath been So clear in his great office, that this virtues Will plead like angels, trumpet-tongued against The deep damnation of his talking-off.† (Act 1: Scene 7: L.16-20) He knew that by killing Duncan who represented a figure of decent human being, heaven itself would detest his decision and he would be condemned. After struggling with his conscience and showing his reluctance to betray the king, he finally decided not to kill Duncan. â€Å"We will proceed no further in this business He hath honoured me of late, and I have bought Golden opinion from all sorts of people,† (Act 1: Scene 7: L.31-33) Macbeth was, perhaps, being selfish and wanted to be admired by the people for a bit longer, or his conscience might be causing his determination to weaken. Both reasons demonstrated that he was showing mercy, and mercy was definitely not a quality of a bloody tyrant. At this stage, he was not yet a bloody tyrant. However, later when Lady Macbeth insulted him by calling him a coward and questioning his masculinity, Macbeth changed his mind. Lady Macbeth’s speech was considered to be very persuasive. She also brought up the concept of being the same in action as in desire to Macbeth. It seems as of every time Macbeth gains back his conscience and follows the path of righteousness, his fatal weakness, which is ambition, always spurs him on and leads him back to the vicious path. His wife also plays quite a major role in manipulating Macbeth to do as she desired. He chooses evil over goodness. This is his own â€Å"free will.† The external force that keeps pressuring him cannot control or decide for him. After murdering Duncan, persuaded by his wife, Macbeth shows the sign of being quite repentant, hoping to undo the crime. â€Å"Wake Duncan with thy knocking: I would thou couldst† (Act 2: Scene 2: L.77) His wife apparently has forced him to do something a bit against his will. At the same time that this happened, Malcolm and Donaldbain decided to elude to England and Ireland respectively to escape the accusation. Macbeth, therefore, was entitled to be king and accessed to the throne. Once Macbeth realised the suspiction BanQuo had on him, including his fear for the witches’ prophecy, that Banquo would be father of a king, would become true, he decided to get rid of Banquo and his son, Fleance. Fortunately, Fleance has escaped. His ambition and pride started to increase. His plan to kill Banquo was kept secret from his wife. This showed that he had gained more self-confidence. His flaw has driven him to kill. Once Macbeth ascended the throne, he organised a feast at his castle. In my opinion, the feast represents the turning point of his character in the play. He began to show more of the vicious qualities. The ghost of Banquo has appeared to him at the banquet, and he began to hallucinate. After the guests have left, Lady Macbeth tried to calm him down. Macbeth was so mad that he has vowed to destroy anyone standing in his way. He was now in the point of no return. â€Å"†¦I am in blood Stepped in so far that should I wade no more †¦ Strange thing I have in head that will to hand, Which must be acted ere they may be scanned† (Act 3: Scene: 4: L.140) â€Å"We are yet but young in deed† (Act 3: Scene 4: L.144) Macbeth was saying that he has done so many bad deeds that he could barely wait to engage in the evil acts again. We could clearly see at this stage that Macbeth’s character has developed into someone who appeared to be malevolent by nature. He had lost all his good equalities. His speech showed his extreme hunger for power and control. He would kill according to his will. Macbeth later went to see the witches again and has received three apparitions. The witches told him that someone who was â€Å"none of woman born† would bring about his death. This prophecy has made him even more arrogant thinking that he was invincible, and it seemed to give him new pleasure for killing. He has Macduff’s family murdered and his castle demolished. After the death of Lady Macbeth, he took actions into his own hands. In the end, he suffered from internal revolt and eventually killed by Macduff, who later revealed that he was born by caesarean. Even though, towards the end, Macbeth has adopted most of the characteristics of evil tyrant, his death produced â€Å"catharsis† in audiences. Our emotions are cleansed knowing that the throne is now in charge by good people. Macbeth started off as being a â€Å"tragic hero†, but eventually, towards the end, his madness and hallucination has transformed him into a â€Å"bloody tyrant.† Bibliography 1. www.literatureclassics.com/essays/371 2. www.shakespearehelp.com/macbeth_guide/ 3. www.kysu.edu/artsscience/ENG411/tragic%20hero.htm

How Far Henry the Eighth Pursued New Policies During the...

How Far Henry the Eighth Pursued New Policies During the Period 1509-1514 Henry VIII became king in 1509. His policies were completely different to his fathers’, Henry VII. Henry VII was a wise and calculating man, who would think through his actions before he would take them, he would consider the long term and short term advantages and disadvantages of his actions. However Henry VIII was quite the opposite and he was emotional and took decisions straight away without analyzing them unlike his father. These differences caused Henry VIII to purse new policies and abolish the traditional ones which had been used by his father. When Henry VIII took the throne in 1509, at the age of 17, he made it†¦show more content†¦When Henry VII was on the throne he had been imposing heavy taxes on the people. The people despised taxes and especially hated the two main taxmen, Richard Empson and Edmund Dudley. So Henry VIII tried to gain the popularity and the support of the people by executing Richard Empson and Edmund Dudley. This definitely gave him the short-term popularity he was after, but without tax, this would affect his finances. Henry VIII’s decision to continue the Hundred Years War cost the government a lot. Around  £1.7 million was spent on preparing England and its allies for war. His aim was to seize the French Crown, and make England and himself greater, by means of war. His policy on finance was not like his fathers, he didn’t realise what problems he would face after stopping tax. His ally in the war was his Father-in-law, Ferdinand Aragon and it was decided that Spain and England would go to war against France in 1512. But Henry VIII’s ideas of conquering France did not succeed. Firstly because the Spanish did not turn up to fight, due to the Pyrenees mountains, on the border of Spain and France. The English troops get dysentery due to the water in France as it was contaminated. Even though Henry VIII failed to attack France, this didn’t prevent him from trying again. In 1513, Henry VIII decided to attack France again, this time with the help of Maximilian who was

How to Tell if a File Exists in Perl

Perl has a set of useful file test operators that can be used to  see whether a file exists or not. Among them is -e, which checks to see if a file exists. This information could be useful to you when you are working on a script that needs access to a specific file, and you want to be sure that the file is there before performing operations. If, for example, your script has a log or a configuration file that it depends upon, check for it first. The example script below throws a descriptive error if a file is not found using this test. #!/usr/bin/perl$filename /path/to/your/file.doc;if (-e $filename) {print File Exists!;} First, you create a string that contains the path to the file that you want to test. Then you wrap the -e (exists) statement in a conditional block so that the print statement (or whatever you put there) is only called if the file exists. You could test for the opposite—that the file does not exist—by using the unless conditional: unless (-e $filename) {print File Doesnt Exist!;} Other File Test Operators You can test for two or more things at a time using the and () or the or (||) operators. Some other Perl file test operators are: -r checks if the file is readable-w checks if the file is writeable-x checks if the file is executable-z checks if the file is empty-f checks if the file is a plain file-d checks if the file is a directory-l checks if the file is a symbolic link Using a file test can help you avoid errors or make you aware of an error that needs to be fixed.

Cell Phone Addiction and Face to Face Conversation

As cell phones have become more and more common in todays society, some people have a significant issue with not being able to disengage from their cell phone. So-called â€Å"smart phones,† which combine functionality of an organizer, browsing the Internet, playing tunes, and taking pictures, only worsen the reliance on one’s cell phone. Cell phones are no longer just a privilege but now have become a necessity. While using such devices for everyday tasks, work, and socializing with friends and family is perfectly normal, not being able to put them down while engaged in a conversation with your significant other or a friend who’s sitting in front of you may denote an increasing problem. In todays society, cell phones have become an addiction and affect our lives in more negative ways than positive ones, causing face to face communication to become less prevalent and loneliness to become the most common ailment of the modern world. With every passing day, technol ogy continues to takeover daily lives. Regardless of ones gender, age, ethnicity, career or financial status, most people own a cell phone. In fact, 91percent of Americans own a cell phone (Archer). 51 percent of which have opted for a smart phone over a standard cell phone and these numbers are rising. The phone, tablet, computer and other high tech devices have become not just an object, but for many people, their best friend. Many of them begin to feel uneasy if they lose their cell phone, even if it is only forShow MoreRelatedHow Cell Phones Affect Social Behavior1282 Words   |  6 PagesEffects of Mobile Phones on Social Skills Kelly Schriever, Matt Seeberger, Mary Sweet, Emily Putnam Elizabethtown College March 17, 2014 Today we live in a world where communication through modern technology is almost required. Everywhere people are texting, emailing, writing blogs, and tweeting. It’s hard to go anywhere without seeing someone using a phone or the internet to connect with others. Most people would feel lost without the use of their phones. Of course theRead MoreThe Social Impact of Cell Phones Essay1465 Words   |  6 Pagesclosest thing to â€Å"cellular technology† was a car phone made by the ATA Company but, Martin and his determined Motorola group yearned higher heights and deeper depths for communication- and thus the birth of the first cell phone was in process. Cooper wanted to exceed the limitations of just simple â€Å"car conversation†. After consistent tedious hours of production, lasting a several month long period of building, critiquing, and finalizing, the first cell phone was born. The first mobile device was the sizeRead MoreImpact Of Cell Phones On Society1509 W ords   |  7 Pagesinternet highlights the latest technology that captivates both young and old. Mobile phones have become an integral part of our society. Primarily, the development of cellphones which combine different sophisticated features has made the device one of the necessities of life. So far, statistics indicate that the number of cell phones in the world supersedes the total population of people. Most people consider cell phones beneficial because of the level of interconnectedness it creates between people aroundRead MoreHow Does Technology Negatively Affect Daily Lives?1304 Words   |  6 Pagesour conversation because it was fragmented. After that, I logged on Facebook, on which I had already spent all my spare time, trying to catch up with my 1000+ â€Å"friends†. Unfortunately, I found most of them I barely know or see. Oh wait, it’s not a dream. It’s happening in reality. 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Even though to many people this seems like a movement in theRead MoreInternet Addiction Essay765 Words   |  4 Pagesand social. Nowadays a lot of teenagers have their own phone and laptop which is convenient to keep contact with friends and family, but they use it to play video game most frequently and there are lots of violent video game affect adolescences have bad habits, the main reason is they get addicted to the internet. Huge negative effects appear if teenagers get addicted to the internet, including can not live without a cell phone, internet addiction disorder and there are negative effects of the internetRead MoreTechnology Has Made Our Liv es1684 Words   |  7 Pages According to Pew Research Center (2015), 91 percent of Americans own cell phones.   For people under the age of 44, the number is closer to 97 percent.   64 percent of those phones are smartphones.   Ã‚  With these phones, we have the world at our fingertips.   We can shop on Amazon and Ebay, get live news updates, and get in touch with our â€Å"friends† from all around the globe on Facebook.   Our cell phones have replaced calculators, cameras, and alarm clocks.   If we want to track our calories, thereRead MoreTexting Is Not Safe ! Haha1430 Words   |  6 Pagesis due to both the psychological damage and danger that smartphones place on their children whose brains are not yet fully developed. According to a study conducted on 404 undergraduate students, three-fourths felt that they are dependent on their phones.() The increasing use and popularity of smartphones are an issue that can cause relationship issues, safety concerns, and distractions all which can be detrimental to society. One of the most detrimental consequences of smartphones is the distraction

Engineering Failure Case Study Free Essays

Failure Analysis at DMRC On July 12th 2009 a metro bridge that was under construction collapsed due to negligence by an office in-charge of the Badarpur Metro line. The failure of the bridge killed 6 and injured another 15 when the pier cap sheared from the connecting pillars. The Delhi Metro Rail Corporation took major heat from this incident because the roadway was a major milestone of providing a reliable and easy mean of transportation to the capitol of India. We will write a custom essay sample on Engineering Failure Case Study or any similar topic only for you Order Now The DMRC is considered the most reputed infrastructure organization of India and neglecting roadways to the point where they fail is not an option. During that day the pier cap collapsed causing the collapse of the launching girder, span between p-66 and p-67 piers which had already been erected and pre-stressed, and also segments of the superstructure for the span between p-67 and p-68. The pier cap (p-67) sheared from the connecting point of the pier and pier cap. The top reinforcement of the cantilever beam did not have any development into the pier itself which caused the shear itself. The launching girder has failed due to the failure of the pier cap. This failure also caused the span between piers 67 and 68 causing it to be inclined supported by the ground on one end and the pier cap on the other. With the failure of the pier cap and span between piers the crane used for lifting the launching girder also failed on July 13th 2009. Bending of the crane shows the clear sign of overloading which was caused by not analyzing the amount of stress the crane could handle. The causes of the failure are many and once one portion of the roadway failed it caused a chain reaction to the entire infrastructure collapsing. The pier (p-67) was initially designed as a leg of a portal frame between piers but then was changed to support the pier cap. The same method was used for piers p-66 and p-68. The top reinforcement was poorly engineered; the pier cap had a reinforcement of 36mm diameter and a length of 500mm which was an insufficient bond length for the structure. During the launching operation the launching girder itself developed a crack that was grouted in crack areas and further strengthened by introducing prop or jacketing. During the launching of superstructure 6 segments where lifted and the whole system collapsed when the seventh segment was hooked up for lifting. It was concluded that the failure of the pier cap occurred to the improper jacketing done when a crack had occurred. This was also coupled with inadequate length of support and reinforcement of the cantilever pier cap. The failure of the cranes was the fact that the capacity of 2 cranes where not able to hold the weight of the superstructure which caused the larger 3rd crane to fail. The Delhi Metro Rail Corporation sacked the official in charge of the Badarpur Metro line, Vijay Anand for neglecting his duty. Structural designs should have been proof checked by an experienced structural engineer. Also once failure had been observed the structure should have been abandoned and a new structure should have been built. Make shift reinforcement to save a failed structure was a major neglecting issue and engineering failure. The lack of professionalism that lead to the superstructure failure started with trying to fix the failed pier cap and neglecting the fact that the cranes used to lift the structure where not engineered to hold the amount of weight that needed to be supported. The support reinforcement should have been checked by an experienced engineer that should have easily seen the reinforcement issue between the pier and pier cap. The information for this case study was found from www. engineeringcivil. com/theory/civil. engineering-disaster. com and www. thaindian. com. The entire structural failure was found on these sites including who was a fault and why the structure failed. How to cite Engineering Failure Case Study, Free Case study samples

Physics Absolute Zero Essay Example For Students

Physics Absolute Zero Essay A According to this website, what is the definition of absolute zero? NAS: Absolute Zero, is when the molecules of the object can no longer oscillate/shake, due to the temperature being too cold, that kinetic energy Is too weak to do anything. The time when the escalation is slowed to the point it can no longer be slowed down, that is when it has reached absolute zero, but even then, escalation can never really be put to a stop. B Why is the Kelvin scale especially helpful when studying absolute ere? NAS: Because it is the same as the others, but it shifts downwards. Water boils at 373 K and freezes as 273 K, and is absolute zero at exactly O. C What is the value of absolute zero on the Kelvin scale? The Celsius scale, and the Fahrenheit scale? NAS: On the Kelvin scale, it is O. Celsius scale is -CHIC. And finally Fahrenheit is -OFF. 2 Visit the following URL: Physician. Com Absolute Zero or Ask a Scientist: Absolute Zero A According to this website, what type of experiments led to the idea of absolute zero? NAS: It was when people were investing the behavior of gas pressure vs.. Temperature, did they find out how the lowest temperature it could get to on a graph was -273 degrees centigrade. B Describe scientists attempts to reach absolute zero. NAS: They would increase the temperature of a gas they are using, and would measure the pressure emitted from it. 3 Visit the following URL: New State of Matter Seen Near Absolute Zero . What is a Bose-Einstein condensate? NAS: It is the experiment the JILL did, and created a far more colder temperature than the other ones which were recorded. They created a new matter which Albert Einstein and Indian Physicist predicted years ago. 4 According to the information you have obtained, you know that absolute zero is about -273 degrees Celsius. You will now use your graph to predict this value based on the laboratory data presented in this activity. A Think back to the Galileo Gardens activity Graphing Tips. You will be using the same prediction techniques to find the value of absolute zero. Go back to your graph from step 5 above. Be sure that the graph window is active. From the menu bar at the top of the screen, select Analyze. Choose Automatic Curve Fit. Select the proper function based on the arrangement of the data points. B Now select Interpolate from the Analysis menu. You can view this in the graphic on the right. Move your cursor along the line of the graph until the y axis value is zero. The corresponding x value is the predicted value of absolute zero. What is the predicted value of absolute zero shown on your graph? NAS: I got -271. 35 degrees centigrade. Physics Absolute Zero By Peacetime