Nowadays, the national policy does not allow for more children, and each family can only have two babies. Many people hope to have both children, so those who have boys hope to have a girl, and those who have girls hope to have a boy. Therefore, many people hope to know the secret of having boys and girls. Who decides to have boys and girls? The editor below will answer this question.
The decision to have male or female children is not made by the female party, but mainly by the male party's sex chromosomes. Sex chromosomes, as the name suggests, are chromosomes that determine gender. In human reproductive cells, there are 23 pairs or 46 chromosomes, of which 22 pairs are autosomes and 1 pair is a sex chromosome. The female sex chromosome is XX, and the genotype can be represented by 46, XX; Male sexual staining is XY, with genotype 46, represented by XY. Reproductive cells undergo two rounds of meiosis, where 23 pairs of chromosomes become 23. The egg contains only one type of sex chromosome, X, while sperm can contain either X or Y sex chromosomes.
After the sperm combines with the egg, the chromosomes of the fertilized egg return to 23 pairs. If a sperm containing X chromosome combines with an egg, the fertilized egg becomes XX type and develops into a female fetus; If the sperm containing the Y chromosome combines with the egg, the fertilized egg becomes XY type and develops into a male fetus.
So, giving birth to a boy or a girl depends on whether the fertilized sperm is X or Y. The combination of sperm and egg is random and not subject to human will, in order to maintain the general balance of the human sex ratio, which is also an ecological balance in nature. This balance must not be disrupted, otherwise it will inevitably cause unimaginable social problems.
Have you learned the secret of giving birth to boys and girls through the above introduction? In fact, both boys and girls are the hearts of their parents. Having a boy or a girl is uncontrollable, otherwise it may cause social chaos.
