For example, when examining differences between male and female beetles, American researcher Nettie Stevens recognized patterns of chromosomes that differed between the two sexes. In particular ...

Excessive X-gene expression is presumed to have decreased female fitness until the X-inactivation system evolved to silence the doubly-dosed genes on one of the X chromosomes in females.

Female (XX) mammals inherit one X chromosome from each parent, but males (XY) receive an X from their mother and a Y sex chromosome from their father. X and Y chromosomes determine not only the ...

two X chromosomes in the nucleus of its original egg cell and it will become a female; a Y and an X chromosome and it will become a male. But exactly what happens in the womb to make a boy or a girl?

Last September, a group of parents and community members gathered at Bow High School and wore pink armbands with “XX” on one ...

In evolutionary terms, fitness is defined as an organism's ability to survive and reproduce its genes into the next ...

Female (XX) mammals inherit one X chromosome from each parent, but males (XY) receive an X from their mother and a Y sex chromosome from their father. X and Y chromosomes determine not only the ...

Men have an X and a Y chromosome, while women have two X chromosomes. Scientists have long dismissed one of the female X ...

A federal judge ruled Monday that two fathers cannot wear pink wristbands with two X’s — the symbol for female chromosomes — drawn on them in opposition to a transgender high school athlete ...

If you're male, your body uses meiosis to create sperm cells; if you're female, it uses meiosis to create egg cells. Others cells in your body contain 46 chromosomes: 23 from your father and 23 ...

Late last month, Stephanie Turner took the knee in protest ahead of her scheduled match against Redmond Sullivan, a ...