Researchers have detected a human genetic variant that influences the sex ratio of children. Additionally, they found that many hidden genetic variants of sex ratio may exist in human populations.

The family of a two year old girl with a condition so rare she is the only person in the world diagnosed with it have said ...

Genes can indirectly influence the age at which girls have their first period by accelerating weight gain in childhood, a known risk factor for early puberty, a Cambridge-led study has found. Other ...

A little girl from Malta is battling a rare genetic disorder that was only discovered 20 years ago. Rian McCann started having twitching movements when she was eight months old. Her mother Danielle, ...

Each year, roughly the same numbers of boys and girls are born. But in individual families, some couples have four or more daughters and no sons, and some have all male children and no female children ...