Which Statement Does Not Apply to Sex Determination in Drosophila

Question

Which statement does not apply to sex determination in Drosophila?
A) Sxl gene is turned on early in development only in XX embryos.
B) Sxl gene is never turned on in XY embryos.
C) Sxl gene is the master regulator of sex determination in Drosophila.
D) SXL protein is a regulator of splicing of Sxl transcripts.
E) Sxl transcript can be differentially spliced.

Accepted Answer

The Sxl gene can be turned on in XY embryos under certain conditions, such as mutations that affect the balance of sex chromosomes and autosomes, leading to the activation of the female developmental pathway in genetically male (XY) flies.