Examining the Crosses Between Drosophila Fruit Flies Introduction The major topic of this experiment was to examine two different crosses between Drosophila fruit flies and to determine how many flies of each phenotype were produced. Phenotype refers to an individual’s appearance, where as genotype refers to an individual’s genes. The basic law of genetics that was examined in this lab was formulated by a man often times called the “father of genetics,” Gregor Mendel. He determined that individuals have two alternate forms of a gene, referred to as two alleles. An individual can me homozygous dominant (two dominant alleles, AA), homozygous recessive, (two recessive alleles, aa), or heterozygous (one dominant and one recessive allele, Aa). There were tow particular crosses that took place in this experiment. The first cross-performed was Ebony Bodies versus Vestigle Wings, where Long wings are dominant over short wings and normal bodies are dominant over black bodies. The other cross that was performed was White versus Wild where red eyes in fruit flies are dominant over white eyes. The purpose of the first experiment, Ebony vs. Vestigle was to see how many of the offspring had normal bodies and normal wings, normal bodies and vestigle wings, ebony bodies and normal wings, and ebony body and vestigle wings. The purpose of the second experiment White vs. Wild was to see how many of the offspring were red eyed male, white eyed male, red eyed female, and white e...
When trying to understand genetics Mendel 's laws are a very big part of it. Mendel 's two laws help us understand and analyze genetic crossings. In our experiment we used drosophila melanogaster flies, a common fruit fly. This was perfect to understand and visualize how the laws take effect. Mendel stated that during the process of genetic crossing; two alleles are formed which then separated to form gametes, which would appear in fertilization. In our experiment we accomplish a cross that determined different eye and body colors. By using the Chi-Square test, we were able to test our results. Our groups hypothesis stated the number of flies from the F2 generation would accommodate Mendelian Genetic Ratio of 9:3:3:1. Our Chi-Square test results
Drosophila is a small fruit fly, it is about 3mm long. This insect is a model organism most commonly used in developmental biology and genetics. The Drosophila fruit flies are especially suited in experiments because of their short life cycle which consist of two weeks; they easily reproduce many offspring, and are also cheap1. The drosophila contains four chromosomes that can easily be experimented on, which allows in-depth observation. In this experiment, Drosophila melanogaster were used to identify the properties of Mendelian inheritance. The Law of Segregation states that allele pairs separate during gamete formation and randomly unite during fertilization and is carried by every individual. The Law of Independent Assortment states that each parent randomly passes on alleles to their offspring. Although, the Law of Independent assortment does not take in account the patters of sex-linked inheritance.
Nuclear power is a relatively new method of supplying the ever growing population with the electricity that is required. Although the majority of people are unsure of how generation occurs, nuclear power provides roughly 17% of the world’s power. (Rich, Alex K...) This makes nuclear power a deciding factor in how the race progresses in technology and energy fabrication as it is able to produce mass amounts of electricity in short periods of time. The limit potential for nuclear power is unclear in not only energy but also weaponry and some medical uses. The fact that uranium and the radioactivity that comes with it are used in facilities and other inventions often lead people to distrust the inventions which, while not entirely un-called for, hinders progress and leads to fables and tales around nuclear energy, its creation, and the nuclear power plants that are springing up around the world. This causes nuclear facilities to slow in their development which only makes things worse because as things progress the facilities will only get increasingly safe as long as they are handled professionally. (Rich, Alex K…) Some of the slanderous fables around nuclear power include things like claiming that nuclear facilities cannot operate during droughts and water shortages. (Kharecha, Pushker…) While nuclear power is accompanied by several risks, it can also be the solution for various global strains and difficulties.
“3.5 million people will experience homelessness in a given year,”(Los Angeles Homeless Services). This shocking number is one of the sad truths in today’s society. Homelessness is caused by a wide range of things including financial issues. The life of a homeless person is hard and comes with set-backs and the constant need to overcome them. Homeless people go through many challenges in surviving without a home. They can suffer from health issues, hunger, and poor emotional well-being.
After the United States developed the atomic at the end of World War II, interest in nuclear technology increased exponentially. People soon realized that nuclear technology could be used for electricity, as another alternative to fossil fuels. Today, nuclear power has its place in the world, but there is still a lot of controversy over the use of nuclear energy. Things such as the containment of radiation and few nuclear power plant accidents have given nuclear power a bad image. However, nuclear power is a reliable source of energy because it has no carbon emissions, energy is available at any time, little fuel is needed for a lot of energy, and as time goes on, it is becoming safer and safer.
Nuclear Energy has many proponents and much opposition. Many of the groups that oppose nuclear power have legitimate concerns, mainly with the dangers of nuclear material in relation with human health concerns and environmental troubles that are risked by allowing nuclear power plants to increase in number. Yet, many of these opposition groups have made outspoken and radical claims about the “hidden” motives of why nuclear power is promoted and subsidized by our federal government. For example, The Nuclear Information and Resource Service claim that the federal government has the intention of committing genocide against Native Americans because uranium mining is predominantly done on reservations. Another cry out by nuclear power opponents is the constant reliving of the few nuclear mishaps that occurred decades ago, at Chernobyl or Three Mile Island. No doubt, past accidents have happened worldwide and are important reminders to not play around with nuclear material, but technology has improved as well, a fact opponents fail to consider. Many of these organizations feel that other sources should be used to supply America’s energy needs. These types of statements tag many opponents to nuclear energy as misinformed, out of touch with scientific facts, or just closed minded to the whole concept of nuclear power. On the other hand, the proponents of nuclear energy like President Bush see it as cheap, and environmentally friendly. As a result, President Bush passed the Comprehensive Energy Bill in 2005 that would increase production of all types of energy, including nuclear, by giving subsidies and tax breaks to nuclear power producers. Keeping safe America’s capabilities for generating electric power by way of nuclear e...
The purpose of this report is to investigate the different views and opinions on the safeness and cost effectiveness of nuclear power compared to other forms of energy. This report will explain the issues and background of the debate, the importance of the issue, and the parties who are involved in this debate with their thoughts.
17. Fruit flies normally have eight chromosomes. The diagram below shows the result of meiosis in three fruit flies to produce gametes with the number of chromosomes indicated. The male then mates with both female A and female B to produce three zygotes (1, 2, and 3).
Homelessness, a devastating experience for people, disrupts virtually every aspect of family life, damaging the physical and emotional health of family members, interfering with the children's education and development and most frequently resulting in the separation of the family.
Homelessness is increasing more every year. In fact, according to the National Alliance to End Homelessness, over 640,000 people experience homelessness every night. (Hunger and Homelessness in North America) By definition, the homeless are groups of people that do not have a home. They can be people who are mentally ill, unemployed, veterans, or even children born into unfortunate families. Since they have nowhere to go, the homeless usually live inside abandoned buildings, in the streets, or in makeshift homes, such as a cardboard box or homemade tent. Although some work to find a decent home, many still suffer from depression or are psychically disabled and cannot work. (Overview of Homelessness in America) These people do not choose to be homeless, instead they become homeless due to a series of unfortunate events; namely losing their source of income or becoming homeless by birth. One instance of this occurred in the life of Hazel Washington. Hazel was fleeing an abusive relationship when she moved in with her relative and his girlfriend, but she was not told about their impending eviction. Because of this, her roommates took everything she owned an...
...for nuclear power has declined as support for renewable energy has increased. Though nuclear power produces zero energy and is seen by many as a cheap way to reduce the world’s carbon emissions (Kessides 2012), several major factors have affected its support amongst the general population. Incidents such as Chernobyl and Fukushima have forever shifted support away from nuclear power (Burton 2006, Cyranoski & Brumfiel 2011) as governments shift support to renewable energy sources that do not pose the same risk.
middle of paper ... ... avour of "purity of the race" idea, but they understand how it worked. Blond hair and blue eyes are recessive genes. Two brown-eyed people can give birth to a blue-eyed child, but two blue-eyed people cannot give birth to a brown-eyed child. Dark skin and dark hair are also dominant genes, so because of evolution, it must mean that the ancestors of humanity had dominant genes.
Even though the consequences of nuclear energy are known by the public, not all people in the society oppose the future development of nuclear energy. Nuclear power is still a safe and clean source of energy...
Other factors in homelessness are addiction and mental disabilities, specifically PTSD in war veterans. Many homeless persons have problems with alcoholism, drug abuse, and possibly gambling. Addiction ruins people’s lives, and many don’t realize it until it is too late. Eventually, an addiction can cause someone to steal from their own family, which then burns a bridge that could’ve helped them out of their situation. In particular cases, certain people with mental issues cannot or will not willingly be institutionalized, and since they have difficulty getting jobs, they live on the streets, panhandling and collection recyclable materials to make money. These are the main causes of homelessness and only scratch the surface of why homelessness exists and who it happens too.
more than half the variation was found to be due to heredity. Among these traits were