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Y chromosome

Y chromosome is a sex chromosome. In human males, each cell has one X chromosome and one Y chromosome. In human females, there is never a Y chromosome. According to research, the Y chromosome of all living men is related to a single male ancestor who lived over 100,000 years ago.

Most human cells contain 23 pairs of chromosomes. One set of chromosomes comes from the mother, while the other comes from the father. The twenty-third pair is called the sex chromosomes, while the other 22 are called autosomes. The sex chromosomes determine the sex of offspring. The father can contribute an X or a Y chromosome, while the mother always contributes an X. The Y chromosome is one-third the size of the X chromosome and contains about 55 genes, while the X chromosome has approximately 900 genes.

A recent study showed that the Y chromosome had lost 640 genes that it once shared with the X chromosome.


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