Henking was the first scientist on the X chromosomes and named them 'X'. Chromosomes that determine the growth of sex cells in a young person are called sex chromosomes. Some chromosomes are called autosomes. Male heterogamety is when the male produces two different types of gametes. It occurs in many animals, such as humans, fruit flies, locusts, etc.

In some animals, this happens to women. That is, women exhibit heterogamety. Examples - birds.