1、 Background and concept of gender ratio in second-generation IVF infants
With the continuous development of science and technology, the second-generation IVF technology has become an effective way for infertile couples to realize their reproductive dreams. The second generation of IVF refers to the baby that is finally born by transplanting the finely processed embryo into the mother's uterus through in vitro fertilization (IVF) and embryo transfer technology. However, unlike natural pregnancy, there is a certain rule in the male female ratio of the second generation of IVF.
2、 Influencing factors of male female ratio of second generation test tube infants
The male female ratio of the second generation IVF is affected by many factors, including genetic factors and technical factors caused by experimental operations.
First, sex is determined by the chromosomes of both parents. Sperm can be divided into X and Y types. Egg has only X chromosome. When the sperm combined with the egg is Y chromosome, the sex of the embryo is male; When the sperm combined with the egg is an X-chromosome, the sex of the embryo is female.
Secondly, the experimental operation will also have a certain impact on the male female ratio of the second-generation IVF. For example, the regulation of embryo culture environment, the length of in vitro culture time, and the selection of artificially implanted embryos may have an impact on the sex preference of embryos.
3、 The rule of the ratio of male and female test tube babies in the second generation
According to the data statistics of several research institutions and the actual observation of hospitals, there is a certain rule in the proportion of male and female test tube babies of the second generation.
First, the rate of male embryos is higher than that of female embryos. According to statistics, the generation rate of male embryos is 51.3%, and that of female embryos is 48.7%. This rule is related to the proportion of X and Y chromosomes of sperm. Y chromosome sperm moves faster, so it can take advantage in the process of fertilization.
The second is age related changes in the proportion of men and women. Several studies have shown that the older the women are, the higher the proportion of men in the second generation of IVF is. Young women are relatively more likely to acquire girls. This may be related to the decline of female egg quality with age.
In addition, the conditions of embryo culture and implantation timing in assisted reproductive technology may also affect the male female ratio of the second generation IVF. For example, implantation on the third and fifth day of embryo culture may lead to a difference in the proportion of men and women.
4、 Summary
To sum up, the male female ratio of second-generation IVF is affected by many factors, including genetic factors and technical factors caused by experimental operations. The generation rate of male embryos is higher than that of female embryos. The older the female is, the higher the male proportion is. In addition, embryo culture conditions and implantation timing may also have an impact on the sex ratio. However, due to individual differences and the complexity of experimental operations, the gender ratio of second-generation IVF is not absolute, and the results of each individual may be different.
Therefore, before the second-generation IVF, individuals should understand the relevant laws and influencing factors, fully communicate with doctors, and make decisions according to their own conditions. It is hoped that the continuous development of second-generation IVF technology can bring hope for more infertile couples to have children.
