Introduction This experiment was designed to examine inheritance patterns in Drosophila melanogaster. Three crosses were set up to examine the inheritance of eye color, body color, and wing shape. The mutant males used in this experiment had: sepia eyes with ebony bodies, white eyes and yellow bodies, or sepia eyes with vestigial wings. All of the females were wild-type. It was also confirmed that the females being used were virgins. This fact was important since female flies can store the male’s sperm and continue to fertilize her eggs, throwing off the results. Overall, D. melanogaster happens to be especially useful for these types of genetic experiments and has been studied for decades (Guilfoile,1997). Because it reproduces quickly, has
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Also, many processes of its development are able to be successfully compared to other organisms, making it perfect for studying inheritance (Guilfoile,1997). Inheritance in genetics is thought to follow rules established by Gregor Mendel. One of these rules is the Law of Independent Assortment. It states that genes of the parents will be independently assorted, as a result of crossing over. Crossing over is an event during meiosis when homologous chromosomes line up and exchange genetic information (Bhagat, R, et al.,2004). Resulting offspring follow set phenotypic ratio’s, which are presumed to be the null hypothesis that experiments are tested against (Brooker). In this experiment, the hypothesis for each of the crosses was that they follow the law of independent assortment resulting in a F2 generation with a 9:3:3:1 …show more content…
Observed offspring of D. melanogaster and the chi-squared analysis to test the hypothesis.
Cross 1- Male and Female offspring virtually the same, however there are more non-recombinants than there are recombinants. (points to linkage)
Cross 2- Major disproportions in phenotypes between genders, suggesting x-linkage. Also, very few recombinants.
Cross 3- Male and Female offspring virtually the same, clearly follows
Also, many processes of its development are able to be successfully compared to other organisms, making it perfect for studying inheritance (Guilfoile,1997). Inheritance in genetics is thought to follow rules established by Gregor Mendel. One of these rules is the Law of Independent Assortment. It states that genes of the parents will be independently assorted, as a result of crossing over. Crossing over is an event during meiosis when homologous chromosomes line up and exchange genetic information (Bhagat, R, et al.,2004). Resulting offspring follow set phenotypic ratio’s, which are presumed to be the null hypothesis that experiments are tested against (Brooker). In this experiment, the hypothesis for each of the crosses was that they follow the law of independent assortment resulting in a F2 generation with a 9:3:3:1 …show more content…
Observed offspring of D. melanogaster and the chi-squared analysis to test the hypothesis.
Cross 1- Male and Female offspring virtually the same, however there are more non-recombinants than there are recombinants. (points to linkage)
Cross 2- Major disproportions in phenotypes between genders, suggesting x-linkage. Also, very few recombinants.
Cross 3- Male and Female offspring virtually the same, clearly follows