Give birth to boy who make woman?
The baby is man or women on earth, was it decided that which party by married couple give birth to boy's daughter? The decisive factor of giving birth to the boy woman is the husband's sperm. There is a material closely related to heredity that lets in the biological nucleus " The chromosome " ,Have 46 pieces of chromosome in people's nucleus, mix into 23 pairs, 22 among them, to determining the calling " autosome " of the general properties of the body and the shape ,Another pair determines the shouting of men and women's gender " The sex chromosome " . Autosome men and women are all the same, but the sex chromosome is different. There are two kinds of sex chromosome, one is called X chromosome, another kind is called Y chromosome. A pair of sex chromosome of man is made up of a X and a Y chromosome, both ones of women's are X chromosome. The ovum is in the ripe course, an egg mother cell splits into two ovum cells which contain X chromosome. And the sperm is in the ripe course, a precise master cell is split into two sperm cells containing X sex chromosome different from Y sex chromosome respectively, so ripe sperm and ovum have 23 pieces of chromosome only, among them there is only a sex chromosome. When the ovum combines with the sperm which contains X chromosome, the embryonated egg produced contains two pieces of X chromosome, the foetus develops into women (XX) ,If the ovum is combined with the sperm which contains Y chromosome, the embryonated egg produced contains XY chromosome, the foetus develops into men (XY) . So the sex chromosome determined to contain in the sperm whose key to foetus' gender lies in and the ovum combines is X or Y.
|
0 comments:
Post a Comment