Sex linkage

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    is located on the X chromosome, causing it to be sex-linked. The v;w mutation is vermillion on the X chromosome and brown on an autosome, chromosome two. These two mutations block the two pigment pathways, the eyes of the fly end up being white in the F1 generation, while the F2 generation will show eye colors of white, bright red, brown, and brick red. This is because while in the beginning, the mutation may be homozygous for vermillion on the X chromosome, it will lead to offspring in the second generation that will not be homozygous for both mutations, causing the assortment of eye colors mentioned. The last two mutations, bw; st, are both mutations found on autosomes, which are chromosomes that are not sex chromosomes. Found on chromosomes 2 and 3, the F2 generation of flies will have eye colors of white, bright red, brown, and brick red. This is due to the fact that again, both mutations block the two pigment pathways, causing offspring to have eyes of various colors. The biochemical pathway that controls the eyes of fruit flies are the brown pigment pathway and the red pigment pathway (Mitrick, 2010). If both pathways are open, the fly will express a brick red eye color, if both pathways are blocked, the fly will have white eyes, if the red pathway is blocked the fly would express brown eyes, while if the brown pathway was blocked, the fly would express scarlet eyes. When looking at the experiment, it was noted that the sex linked mutation expressed only brick red, or…

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    Evolving Genetic Ideas

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    activate the OCA2 gene that actually controls the pigment. If one of these genes malfunctions, the eye lacks pigmentation, making it blue. This explains the phenomenon of two blue eyed parents having a brown eyed baby. Let’s say dad has a working HERC2 gene and a broken OCA2 gene, and mom has a broken HERC2 gene, and a working OCA2 gene. It is possible for this couples child to inherit dad’s working HERC2 gene and moms working OCA2 gene. So, don’t worry, you beautiful brown eyes probably didn’t…

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    Essay On Color Blindness

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    Color Blindness is defined as the inability or decreased ability to see color, or perceive color differences, under normal lighting conditions. Color blindness is also referred to as color vision deficiency. In the United States alone there are about three million cases noted per year for color blindness. This disorder seems to affect men more than it does women. It is estimated that around eight percent of males and a little less than one percent of females are diagnosed in the United…

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    about our existence and create diversity. This diversity arises from the fact that there are different forms of genes known as alleles. All the alleles of an organism are referred to as that organism’s genotype and results in an organism’s phenotype, or physical appearance (ie. Widow’s peaks are a human phenotype that results from the genotype ww)2. To study inheritance of genes, Mendel used a punnett square to preform monohybrid crosses in which one character trait (i.e. eye color) is studied…

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    the stage of the microscope. After this is done, one fly was observed at a time by moving one of the flies into view by using a brush. By looking at the Drosophila melanogaster the phenotype and sex was observed by looking for particular characteristics. A female fly can be distinguished from a male because she has stripes and males have dark underbellies. The wings were also examined and were determined to be wild type or vestigial mutant. Wild type had wings that were long, circular, and…

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    Ectodermal Dysplasia Jonathan Moon American Fork Junior High A2 2/24/17 Abstract Ectodermal Dysplasia is a group of conditions that interfere with the normal functions of skin, hair, nails, teeth or sweat glands. These abnormalities cause various issues with everyday activities such as eating, brushing hair, exercising, and blinking. This paper will explain how this disease occurs, its symptoms, diagnosis, and treatment. Causes of ED Ectodermal Dysplasia, or ED, is a genetic disorder that…

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    Ebony Lab Report

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    Discussion: My first hypothesis that the sepia eye and ebony body experimental cross would result in a 9:3:3:1 ratio, and that the traits would be autosomal, unlinked recessive, was found to be false. I chose to reject my hypothesis because my calculated test statistic, 587.5, was larger than the critical value, 7.815. The traits, ebony and sepia, are linked, seeing that they fit in 2:1:1 linkage ratio and that the recombinant number is smaller (Table 1.1). They are autosomal; the amount of…

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    Gamble My mind was a crystal vase that contained only one desire, which was to win. I slumped back into my red leather chair, as the Slots machine again stole my money, it was my sixth loss in a row. The big flashing red words of “LOSS” on the digital screen and the loud voices of joy fed on my insecurities. I was sitting here bleary-eyed and unshaven in front of this wealthy machine, but I was only adding to its wealth, as I slowly munched through the family’s life savings. I just spent 2 hours…

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    understand the disease, investigations were done to identify the gene that is linked with the disease. Some of the common approaches to do this was linkage analysis and positional cloning often involving the use of polymorphic DNA markers to identify the best candidate gene that can…

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    What determines the sexual orientation or gender identity of a person? The answer to this question is generally complex. Before discussing this subject further, we must define and distinguish the difference between these terms. Sex is the biological distinction between males and females marked by genitalia, and sexual orientation is a preference of romantic partners based on attraction. Gender is a social construct designed to use behaviors and characteristics to define individuals as men and…

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