When the genetic code (XX or XY) begins to assert itself,
A) genetic activity on the Y sex chromosome causes ovaries to begin to differentiate.
B) genetic activity on the X sex chromosome causes ovaries to begin to differentiate.
C) ovaries begin to differentiate if the Y sex chromosome is absent.
D) testes begin to differentiate if the Y sex chromosome is absent.

Question

Quizplus · Accepted Answer

Ovaries begin to differentiate by default in the absence of the Y chromosome. The presence of the Y chromosome (specifically the SRY gene) triggers the development of testes, not ovaries.

When the Genetic Code (XX or XY) Begins to Assert