The scientific principles behind the birth of boys and girls
Having a boy or girl has always been a topic of concern, and now science can explain the principles behind this phenomenon. The following will explain the scientific explanation of the principles of male and female birth from four aspects: heredity, germ cells, hormones and environment.
Heredity
The birth of a boy or girl is first related to the genes of the parents. Among the 23 pairs of chromosomes in humans, the 23rd pair determines the gender of the child. The mother\’s 23 pairs of chromosomes are XX and the father\’s are XY. If the sperm carries an X chromosome, it will become a girl when it fertilizes with the egg; if the sperm carries a Y chromosome, it will become a boy when it fertilizes with the egg. Therefore, gender is determined by the father. In addition, the genes contained in male children and female children are also different, which is one of the reasons for the personality differences between boys and girls.
Germ cells
In addition to genetic factors, boys and girls also have different germ cells. The number and vitality of male and female reproductive cells are different. Male sperm have a larger number, faster speed, but weaker vitality; while female eggs have a smaller number, slower speed, but stronger vitality. This is also one of the reasons for the difference in pregnancy probability and male-to-female ratio.
Hormones
There are also differences in hormone levels in adult men and women, which is also an important factor in the birth of boys and girls. Research shows that if a pregnant woman has higher levels of progesterone than estrogen, she has a greater chance of giving birth to a boy. And if the level of estrogen in the body is higher than the level of progesterone, there is a greater chance of giving birth to a girl. In addition, the food the mother eats during pregnancy, the environment and the season can also affect hormone levels and thus the gender of the child.
Environment
Finally, environmental factors are also one of the important factors that affect the birth of boys and girls. Studies have found that high-temperature environments can affect the quality and quantity of male sperm, thereby reducing the probability of pregnancy, which may lead to the birth of a girl; while low-temperature environments may increase the probability of pregnancy, which may lead to the birth of a boy. In addition, external factors in the environment such as chemical pollution, radiation, noise, etc. may also have an impact on male sperm and female eggs.
To sum up, the principle of having a boy or girl is the result of the interaction of multiple factors, including genetics, germ cells, hormones and environmental factors. Understanding these principles can help parents better implement their birth plans. At the same time, having a boy or a girl should not be the only or main criterion for people to evaluate a family or a life, nor should the pressure and prejudice of having a boy or a girl affect the health and happiness of couples and children.
