Download Biology X And Y Chromosomes Background. Gender is controlled in humans by the x and y chromosomes. Females have two x chromosomes, and males have one x and one y chromosome.
It occurs as pairs in females, but only a single chromosome can be found in males.
These differences can be seen physiologically because male have xy thus it has less no. 1 22 pairs of chromosomes are in every human body cell. The main difference between them is the no of genes present in them x chromosome have greater no of genes than y chromosome. Previous studies proposed a substantial difference between x and y spermatozoa, however, recent studies suggest negligible or no differences between these spermatozoa with respect to ratio, shape and size.
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