In a developing fetus, what influences whether it is going to become male or female? What influences the cells to start building male or female organs?

Question

In a developing fetus, what influences whether it is going to become male or female? What influences the cells to start building male or female organs?

In: 274

Answer 1

depends what sperm gets to the egg. its random wether each sperm has the X or Y chromosome.

the woman’s egg always has an X chromosome.

when they combine together, you have only 2 choices – XX or XY
(besides some uncommon anomalies where there is a different combination, this for example is how down syndrome happens)

if its XX, its a girl, if its XY its a boy