A chromosome is a single, long molecule of DNA. These highly organized structures store genetic information in living organisms. Small sections of the chromosome, called genes, code for the RNA ...

Cephalopods may have the oldest sex chromosomes of any animal, according to a new discovery in the octopus genome. That's a ...

X inactivation is the dosage compensation mechanism in mammals whereby during embryogenesis of females a single X-chromosome is genetically silenced. Although most genes are subject to X ...

What stands out the most about this ancient cephalopod sex chromosome is how little the chromosome has changed over time.

This unmatched pair, known as the X and Y sex chromosomes, determines whether we are male (XY) or female (XX). A mother always provides a single X chromosome in her egg. Inherit an X from your ...

A study finds that female mice using only a maternal X chromosome experience faster brain aging, leading to memory loss.