Question

which factor most influences the development of a female fetus?
the presence of a y chromosome
none of these
the absence of a y chromosome
the presence of any two sex chromosomes
the presence of two x chromosomes

Explanation:

In humans, biological sex is determined by sex chromosomes. Females typically have a pair of X chromosomes (XX), while males have one X and one Y chromosome (XY). The presence of the Y chromosome is what leads to male development. So, the absence of a Y chromosome (since females don't have a Y) is a key factor in female fetal development. Just having any two sex chromosomes isn't specific enough (as it could be XY - male). And having two X chromosomes is the result of the absence of a Y (in the context of normal human sex - chromosome determination where the sperm contributes either an X or Y, and if it's X, then with the egg's X, it's XX - female, which is due to no Y from sperm).

Answer:

the absence of a Y chromosome