Basic Medicine:Secrets of the Sequence(16)

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Basic Medicine:Secrets of the Sequence(16)

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In the human genome, there are 23 pairs of chromosomes. For 22 of these pairs, a chromosome from the fahter teams with the same chromosomes from the mother, the 23th chromosome is different. It can come from an X version and a Y version. The egg always has a single X chromosome, sperm can carry either an X version or a Y. If it is an X, the embryo develops with an XX pair, and it's female; If the fertilized sperm carries a Y, it's a boy.

  • Added:2006
  • Country:America
  • Subtitles:
  • Language:English
  • Duration:30
  • Time of update:2011/8/16 11:06:08

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