The male-determining sex chromosome has lost 97 percent of its ancestral genes in the last 300 million years. If that rate ...

The string of genes that make a man a man used to be much bigger, and some geneticists say it may be wasting away. Back off, others say. Y has... With Men's Y Chromosome, Size Really May Not Matter ...

It was long thought that during an embryo's first cell division, one spindle is responsible for segregating the embryo's chromosomes into two cells. Scientists now show that there are actually two ...

The Y chromosome may be a symbol of masculinity, but it is becoming increasingly clear that it is anything but strong and enduring. Although it carries the “master switch” gene, SRY, that determines ...

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 ...

Women can be colorblind, but it’s much less common than in men. Red-green color blindness, the most common type, is inherited through the X chromosome. Since males have only one X, they need just one ...

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 ...

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 ...

It was long thought that during an embryo's first cell division, one spindle is responsible for segregating the embryo's chromosomes into two cells. EMBL scientists now show that there are actually ...