What is pair 23?

What are the differences in pair 23 for male and females?

Which chromosome does each gamete carry?

What is the chance of having a boy?

When does the male embryo's testes start to develop?

What causes the growth of the male testes?

what do testes produce?

What do androgens cause?

What happens if no male sex hormone is present?

What are hormones?

How do hormones reach their target cells?

What happened if a person produces androgen but their cells don't respond?