How does Nature balance both genders so well? They are almost 50/50

Question

Basically the Title. How are our body’s so good at regulating how much males and females are born, if they aren’t aware of the Balance at all?

In: Biology

Answer 1

Well sex determination is different based on species, but for humans, it’s pretty simple. Sex is determined by the 23rd chromosome, Women have an XX and men have an XY. So it’s that second letter that matters. The mother’s egg cell always has an X chromosome, but the father can give either an X or a Y with his sperm cell, with roughly equal probability. A roughly equal number of male and female babies means a roughly equal number of adult men and women.