In mammals, the Sry gene on the Y chromosome is instrumental in the male sex determination process. However, in Drosophila, the Y chromosome is not associated with male sex determination, but it contains genes required for sperm development in the adult. The copy number of the X chromosome is linked to sex determination. Drosophila with two X chromosomes (e.g., XX) are female, and those with one X chromosome (e.g., XY) are male.
What would be the resultant phenotype of an XO Drosophila genotype?
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a
A fertile female
b
A sterile female
c
A fertile male
d
A sterile male
b
A sterile female
The resultant phenotype of an XO Drosophila genotype would be a sterile female. Thus, the correct answer is option b: A sterile female.
To determine the resultant phenotype of an XO Drosophila genotype, we need to understand the sex determination mechanism in Drosophila. In Drosophila, the number of X chromosomes determines the sex of an individual. Females have two X chromosomes (XX), while males have one X chromosome (XY).
In the case of an XO genotype, it means that the individual only has one X chromosome and lacks a second sex chromosome. In Drosophila, this genotype typically results in a male phenotype. Therefore, the correct answer is:
c) A fertile male