Aging men often lose the Y chromosome in a growing number of their cells—and it may be far more dangerous than once believed.

Human sex chromosomes originated from a pair of autosomes, the ordinary or non-sex chromosomes that contain the majority of our genome and come in identical pairs. That ancestral pair of autosomes ...

Basic biology has it that girls are girls because they have two X chromosomes — the things inside cells that carry our genes. Boys are boys because they have one X and one Y. Recently, though, there's ...

The biological necessity of the Y chromosome is undergoing a fundamental reassessment as evidence confirms its disappearance in specific mammalian lineages. While this chromosome has served as the ...

Having extra chromosomes is typically an issue for an organism and can disrupt development or cause disease. But some cells benefit instead: For example, cancer cells or pathogenic yeasts can use ...

A global research team has built five new synthetic yeast chromosomes, meaning that 30 percent of a key organism’s genetic material has now been swapped out for engineered replacements. This is one of ...

Turner syndrome is a chromosomal condition involving a person’s sex chromosomes. It is considered mosaic when an X chromosome is missing in some cells in people who have two X chromosomes. Share on ...