Why don't males have Barr bodies?

Answer 1

Both Male and Female have the barr body, but in different chromosones.

The above statement is INCORRECT.

Barr bodies are formed mainly in females due to females having two X chromosomes while males normally have only one X chromosome (and a Y chromosome). The Barr body is formed from the inactive X chromosome.

Males can sometimes be born with a mutation of having too many X chromosomes, in which case Barr Bodies would also be found in those specific males which typically causes Klinefelter's Syndrome.

Answer 2

This is Biology--it's not specific to humans. In species where the sex is determined by the presence of a Y chromosome (which includes most mammals, including humans) the females have two X chromosomes in each cell of the body and the males have one X and one Y chromosome. In order for the cell to work properly, there can be only one functioning X chromosome, so one or the other X chromosomes must be inactivated.

X-inactivation occurs early in the development of the embryo. Independently, each embryonic cell will randomly and irreversibly inactivate one of the two X chromosomes in its nucleus. Once an embryonic cell has inactivated one of its X chromosomes, all the cells derived from it will inactivate the same X chromosome. As the cells develop, the inactivated X chromosome is compacted into an inert bundle called a Barr body.

Since males have one X and one Y, no inactivation takes place, so there is, in general, no Barr body found in the nucleus of somatic cells in male mammals.

Answer 3

Because their single X chromosome is still active