怀孕佳期到了!（Pregnant day to!）.docVIP

怀孕佳期到了!（Pregnant day to!） Who decides whether to have a baby or a baby? Im X chromosome! Im from a gentle mother! Im Y chromosome! Im from majestic dad! Dont underestimate our two X and Y, we can determine a babys sex! Each person has 23 pairs of chromosomes, 22 of which are autosomal, the male and female are the same, and the other is the sex chromosome, which makes the difference between men and women. The female baby has 2 X chromosomes, while the male baby has only 1 X chromosomes, and the other is the Y chromosome. The 46 chromosomes that my father and mother put together have more than 50 thousand genes, each with genetic information. Chromosomes communicate genetic information accurately to offspring through a series of events. Dads sperm and mothers eggs undergo two meiotic divisions, reducing the original 23 pairs of chromosomes by half. When sperm and eggs are combined into fertilized eggs, each chromosome in the sperm nucleus is paired with the corresponding chromosomes in the egg nucleus, restoring the chromosome number of the fertilized egg to 23 pairs. One of each pair of chromosomes comes from dad, the other from mother, so the resulting baby has genetic information from both parents. When the X comes from the mother, and two types of sperm (X, Y) come from dad, the male and female are born: (1) the egg combines with the sperm with the X chromosome, producing the XX type fertilized egg and developing into a female baby. (2) the egg combines with the sperm with the Y chromosome, producing the XY type fertilized egg and developing into a male baby. The best combination of parents child-bearing age Recent studies by French geneticists have found that women are between the ages of 23~30 and men, and the age at which they are 3035 is the best age for childbearing. This is because the womens physical and mental development is fully mature at this time, and the quality of the eggs is high. If the baby is pregnant, the complications are less, the risk of chil