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Question: 5 a what are the sexual phenotypes of the following...

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*5. a. What are the sexual phenotypes of the following genotypes in Drosophila: XX, XY, XXY, XXX, XO? (2.5 pts) b. What are the sexual phenotypes of these same genotypes in humans: XX, XY, XXY, XXX, XO? (2.5 pts) c. Consider this genotype: XXY. A fly with this genotype is an intermediate body color, while a person with this genotype has randomized light and dark patches all over their skin. Assuming that this gene is homologous (has a similar origin and similar function), explain the difference in observed phenotype. (2 pts) *6. In a species of fish, a black spot on the dorsal fin is observed in males and females. A fish breeder carries out a pair of reciprocal crosses and observes the following results Cross 1 Parents: black-spot male x nonspotted female Progeny: 22 black-spot males 24 black-spot females 25 nonspotted males 21 nonspotted females Cross 2 female Parents: nonspotted male x black-spot Progeny: 45 spotted males 53 nonspotted females a. Why does this evidence support the hypothesis that a black spot is sex linked? (2 pts) b. Identify which sex is homogametic and which is heterogametic. Give genotypes for the parents in each cross, and explain the progeny proportions in each cross. (6 pts)
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