It's good pregnancy Q&A time again!
Sister Ping selected the most representative questions of the sisters to answer
Let's see if it's the ha you asked
@Lili sauce
Sister Ping, I have a first child and two children are girls, but the older generation of the family has always wanted us to have a boy, I feel a little strange that I can't give birth to a boy, what is the decision of this boy and girl?
I often hear such complaints: my daughter-in-law's belly is not contentious, and she has added a girlfriend. Every time Sister Ping heard it, she was particularly distressed by the sisters.
Do you know? The sex of men and women is actually determined by sex chromosomes. In human cells, there are a total of 46 chromosomes, or 23 pairs. Of these, 22 pairs are both male and female, called autosomal, and 1 pair is different in males and females, called sex chromosomes. The sex chromosome for women is XX and the sex chromosome for men is XY.
When female oocytes undergo meiosis, there are only X-type sex chromosomal eggs; while male sperm cells undergo meiosis, they produce two types of sperm: one contains X sex chromosome sperm, and the other class contains Y sex chromosome sperm.
Image source: Sharp View Gallery
At the time of fertilization, if a sperm containing an X sex chromosome combines with an egg, it becomes a fertilized egg of the XX karyotype, which will develop into a female in the future; if the sperm containing the Y sex chromosome combines with the egg, it becomes a fertilized egg of the XY karyotype, and it will develop into a male in the future.
In this way, the premise of giving birth to a boy must be that the Y-chromosomal sperm from the male binds to the egg cell. Therefore, the birth of boys and girls is the father's decision, and the daughter-in-law's belly does not count!
I wish you all a good pregnancy in the Year of the Tiger