Boy or girl? Probability is a magical thing

People are more sensitive to the issue of having a boy or a girl, but this is not a random question. It is the combination of sperm and egg, and the final phenotype is genes. The ratio of boys to girls is 1:1 in medicine, but in fact, it is not universal for everyone. For some people, it is 1.15:1; that is to say, some families have more boys than girls. This is our Said genetic factors.

There is a mystery to being a boy or a girl, but the mystery is not determined by fate, but by both men and women. The sex ratio at birth is generally 1:1 without artificial selection. The gender of the fetus is determined by sex chromosomes. YX represents male and XX represents female. The human body has 23 pairs of chromosomes, 22 pairs of autosomal chromosomes and 1 pair of sex chromosomes.

The sperm and egg combine to form a fertilized egg. In this way, the 23 chromosomes in the sperm and the 23 chromosomes in the egg are paired into 23 pairs of chromosomes. If an X sperm combines with an egg, the pair of sex chromosomes in the fertilized egg will be XX, and the fetus will develop into a female; if a Y sperm combines with the egg, the pair of sex chromosomes in the fertilized egg will be XY, and the fetus will develop into a male. It can be seen that whether a boy or a girl is born depends on whether the sex chromosome carried by the man\’s sperm is X or Y, and has nothing to do with the egg. The gender of a child is determined at the moment of fertilization, with both parents accounting for half of the determining factor.

Scientists studied this problem as early as the 1970s. Researchers usually use pH value to express acidity and alkalinity. When the pH value is equal to 7.0, the solution is neutral, when the pH value is less than 7.0, it is acidic, and when the pH value is greater than 7.0, the solution is alkaline. The researchers washed and soaked the two types of sperm with acidic and alkaline solutions with a pH value of 5.2 to 8.0, but the results found that there was no significant difference in the motility changes of X sperm and Y sperm. There are also researchers who treated rabbit sperm with solutions of different pH and then conducted artificial insemination. There was no significant difference in the sex ratio of the rabbits born. Moreover, in this experiment, the sperm soaked in acid solution were used to give birth to rabbits. The proportion of male rabbits is slightly higher, but it is not statistically significant. It can be seen that there is no scientific evidence to support the statement that \”X sperm is acid-resistant and Y sperm is alkali-resistant.\” Therefore, using alkaline solution to rinse the vagina will not increase the chance of giving birth to a boy. Instead, it will destroy the normal acidic environment in the vagina and make it easier to suffer from vaginitis. If you are infected with vaginitis during pregnancy, it may lead to miscarriage or premature birth in severe cases.

In fact, sperm Y is more fragile and cannot wait as long as sperm X. The closer to the ovulation period, the thinner the cervical mucus, and the more alkaline it is, the more suitable this environment is.Survive on the Y chromosome. vice versa. The higher the orgasm a woman feels, the more alkaline secretions there are, and the easier it is for Y sperm to survive. In the same way, ejecting semen into the shallow part of the vagina intentionally makes it difficult for Y sperm to travel long distances, which helps X sperm to stay ahead and combine with the egg first.

There are many rumors on the Internet about having a boy or a girl, most of which are not correct. It is just a matter of chance. It is better to let nature take its course.

If it is necessary to select the gender of the fetus due to a certain genetic disease, the following methods can be used to identify it.

B-ultrasound: It can only be performed after 16 weeks of pregnancy, and the accuracy rate is 80% %, and the fetal position needs to be coordinated.

Amniocentesis: It is performed between 16 and 20 weeks of pregnancy, with an accuracy of 99% and a probability of 1% Miscarriage rate.

Chrionic villus biopsy: It is performed at 10 to 12 weeks of pregnancy, with an accuracy of 99% and a 3% accuracy rate. ~5% miscarriage rate and resulting in fetal disability of hands and feet.

DNA blood identification: Blood can be drawn to identify gender as early as 7 weeks into pregnancy, with an accuracy of 99.4%. Most reliable.

This article is provided by Baidu Reading. It is excerpted from \”Very Good Pregnancy: You Can Get Pregnant by Doing This\” Author: Yu Yue\’e