One of the fundamental rules of inheritance states that different alleles (gene copies) of a trait, such as sex, are ...

Modern genetics reveals that over 50 genes across many chromosomes—not just X and Y—govern sex development. The term “sex chromosome” is thus a misnomer that science should retire for a more accurate ...

Doctors discovered a woman had "blood chimerism" after examining the chromosomes of cells from different parts of her body.

The strongest sex differences were in the testes and other reproductive tissues, but, surprisingly, most other tissues also ...

Activists quietly shifting the goalposts on sex-and-gender discussion to escape the fact they're currently losing the biology of sex debate.

Men are from Mars, and women are from Venus—or so the saying goes. While this may be a generalization, there’s no doubting ...

Is it possible that Y Chromosomes might actually disappear from genetic code? What would happen to species as we know them? We're generally taught that chromosomes determine an animal's sex, but turns ...

Differences between men and women in intelligence and behaviour have been proposed and disputed for decades. Now, a growing ...

Medical research has long sought to gloss over the hormonal and chromosomal complications typical of female biology. But ...

A Brazilian woman is discovered to be a human 'chimera'. She carries her twin brother's DNA in her blood cells, making her ...