6. Consider a species with ZW/ZZ chromosomal sex determination and recall that,

Question

6. Consider a species with ZW/ZZ chromosomal sex determination and recall that, by definition, ZW individuals are female and ZZ individuals are male If the number of Z chromosomes is the key determinant of sex in this species (in the same sense that the number of X chromosomes is the key determinant of sex in Drosophila), would you expect individuals with the following aneuploid genotypes to be more male-like or more female-like? a. b. If the presence or absence of W chromosome is the key determinant of sex in this species in the same sense that the presence or absence of the Y chromosome is the key determinant of sex in mammals), would you expect individuals with the following aneuploid genotypes to be more male-like or more female-like?

Explanation / Answer

6. a) i)) ZO: Female it produces two type of gametes one with Z chromosome and one without it.

ii))ZZW: Is female to start with but develop male characteristics but no fertile gametes.

b) i)) ZO: It would be a female as the W chromosome is not present which gives male characters.

ii))ZZW: Male because We character gives male character.

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