Some women are genetically XY.What is the most likely explanation for this?
A) The DAX1 gene has been deleted from their X chromosome.
B) The SRY gene has been deleted from their Y chromosome.
C) They have an extra SRY gene.
D) The SRY gene is pleiotropic.
E) The DAX1 gene is pleiotropic.

Question

Quizplus · Accepted Answer

The presence of the SRY gene, typically found on the Y chromosome, is responsible for the differentiation of male gonads in embryos into testes instead of ovaries. If the SRY gene is deleted from the Y chromosome or translocated onto an X chromosome, an individual with female external genitalia and internal testes (or other intersex conditions) will result. Therefore, a woman with a genetic XY sex chromosome constitution likely has a deletion of the SRY gene from the Y chromosome.

Some Women Are Genetically XY