How many chromosomes do humans have? Humans have 23 pairs of chromosomes, or 46 total, and 22 of these pairs are numbered chromosomes, known as autosomes. The 23rd pair is a pair of sex ...

Sex chromosomes are more complex than most people think. While we’re usually taught that there are two types — XX and XY — many more variations exist.

The sex chromosomes raise an interesting dilemma: females (XX) carry twice as many X-linked genes as males (XY), and this double dose is lethal to the early embryo. So how does nature resolve this ...

Every chromosome contains many genes, with each having a different function.For example, some instruct cells on how to make certain proteins. Overall, the function of chromosomes and genes is to ...

Instead of having two copies of each chromosome, as is typical for normal cells, the cancer cells had anywhere from one to as many as five or six copies; and sometimes there were parts of chromosomes ...

A human cell carries in its nucleus two meters of spiraling DNA, split up among the 46 slender, double-helical molecules that are its chromosomes. Most of the time, that DNA looks like a tangled ...

A new study has shown how chromosomes change shape during cell division. Certain protein complexes help fold DNA into overlapping loops that repel each other, which then stack to create a rod-like ...

The X chromosome is packed with hundreds of genes, ... Stanford dermatologist Dr. Howard Chang was exploring how Xist does its job when his lab identified nearly 100 of those stuck-on proteins.