Autosomal chromosomes are homologous, meaning they code for similar traits. For example, the two copies of chromosome 1 will have copies of the same genes — one from each parent. Sometimes one ...

In humans and many other animals, specific chromosomes determine sex. But how did researchers discover these so-called sex chromosomes? The Sex of Offspring Is Determined by Particular Chromosomes ...

X chromosomes are expressed differently depending ... there are some commonalities. For example, males tend to be stronger, bigger, and have deeper voices. They also enter puberty later than ...

Females (XX) carry twice as many X-linked genes on their sex chromosomes as males (XY). How do cells control gene expression to manage this potentially lethal dosage problem? A prime example of X ...

Chances are you've seen an illustration of DNA's double-helix structure and even pictures of the chromosomes that comprise the human genome. But where and how does the famous double helix fit into ...

Female mammals typically carry two X chromosomes — one from each parent — and a new study suggests that the maternal X is linked to faster brain aging.