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Part One: Introduction The common fruit fly, Drosophila melanogaster had been used in genetics studies for years. One of the first geneticists to use fruit flies was Thomas Hunt Morgan back in early 1900s. Fruit flies make good subjects for studying genetics because… Fruit flies life cycle begins with… In lab we studied 3 crosses; monohybrid, dihybrid, and sex-linked. Part Two: Lab Work A. Monohybrid Cross a. Description of Cross i. Trait studied: eye color ii. P generation was crossed and the F2 generation was observed. iii. In fruit flies, wild eye (red color) trait is dominant while the sepia eye (brown color) trait is recessive. iv. The genotypes of the P generation fruit flies crossed are homozygous wild eye (RR) crossed with a homozygous sepia eye (rr). b. Hypothesis i. If homozygous wild eye fruit flies are crossed with homozygous sepia eye fruit flies in the P generation then a ratio of… will be observed in the F2 generation. c. Data Chart Wild Eye Sepia Eye Group Data: Class Data: 1539 592 d. Chi Square Results i. Chi square results class data = B. Dihybrid Cross (use same format as shown above) a. Description of Cross b. Hypothesis c. Data Chart C. Sex-Linked Cross (use same format as shown above) a. Description of Cross b. Hypothesis c. Data Chart Part Three: Conclusion According to Gregor Mendel, the Law of dominance… the Law of Segregation… The Law of Independent Assortment… These laws were used to predict the outcomes of the genetic crosses studied in class. In the monohybrid cross, our group hypotheses a 3 to 1 ratio of wild eye to sepia eye in the F2 generation. Our hypothesis was based on Mendel’s Law of Segregation. A Chi square value of … for the group data shows there is no significant difference between the observed and expected frequencies, therefore our hypothesis is accepted. In the dihybrid cross…