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Explain the mechanism of *** determination in humans.? |
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Answer» Human beings have XX_XY *** determination system. In this, the males have XY *** chromosomes. They produce two types of gametes having X and Y chromosome. The females have XX chromosome. They produce only one type of gamete having X chromosome. The *** of a child is determined by the type of chromosome he/she receiving from the father. If sperm is having X chromosome, then the child will be a girl. If sperm is having Y chromosome, then the chilld will be a boy. The Y chromosome carries factors responsible for triggering male development. The X chromosome carries factors responsible for triggering female development. *** determination in humans is of XX-XY types. Human has total 23 pairs of chromosomes; 22 pairs of autosomes and one pair of *** chromosomes. In humans, females are homomorphic (XX) and males have heteromorphic *** chromosomes (XY).\xa0During meiosis, all the gametes produced by females contain only the X chromosome (22 A + X), whereas males produce two kinds of gametes, 1/2 gametes with X - and 1/2 with Y-chromosome (22 A + X and 22 A + Y). Fertilization of egg (22 + X) with sperm carrying 22+X chromosomes results in female child (44A + XX). Fertilization of egg (22 + X) with a sperm carrying 22+Y chromosomes results in a male child (44A + XY) |
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