When one sperm and one ovum unite at conception, the 23 chromosomes from each parent come together and form a new being (the zygote) with 46 chromosomes. The 23rd chromosome pair determines the gender of the individual: Two X chromosomes (one each from the mother and father) produce a female, and a combination of an X chromosome and a Y chromosome (from the mother and father, respectively) produces a male.
If you look at the photograph of human chromosomes below, you can see the XY pair near the bottom right corner, which makes this individual a male.
Posted by: Maraldy Gutierrez
1 comments:
It's interesting to see how the chromosomes actually look. When you look at the 23rd chromosome you know whether a person is a boy or a girl.
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