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 ...

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 ...

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 they’ll never give up on her. Bridget McNally was born with the one of a kind ...

Genetic testing is helping doctors identify rare diseases earlier, opening the door to treatment options before symptoms appear.

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.