For example, in the XX-XO system found in crickets, grasshoppers, and some other insects, sperm cells that lack an X chromosome (referred to as O) determine maleness. Here, females carry two X ...

Inactivation also explained why XO female mice were able to survive with a single X chromosome. In her second paper on this subject (1962), Lyon extended her analysis to other species, including ...

The X chromosome carries at least 150 genes linked to intelligence. Since the mother has two X chromosomes to pass along while the father only has one, the mother’s contribution to the child’s ...

In a surprise, work in mice has found that the dormant X chromosome in females can reawaken late in life and turn on genes that keep the brain healthy. UCSF researchers may have discovered how the ...

Females carry two X chromosomes. One of them is ensconced in a corner in the cell called the Barr body, where it can't express many genes, and scientists thought it didn't do much of anything.

(A condition in which there is an absence of a sex chromosome in the egg or the sperm may result in conditions such as Turner ...

Females carry two X chromosomes. One of them is ensconced in a corner in the cell called the Barr body, where it can’t express many genes, and scientists thought it didn’t do much of anything. But the ...