Why are chromosomes abnormal

Moreover, we have learned the importance of chromosomes in junior high school biology textbooks. Although the introduction is relatively simple, it also tells people that normal body temperature has 23 pairs of chromosomes, and if a chromosome is suddenly missing, it is likely to cause congenital malformations. Therefore, human chromosomes also play a very important role in genetics. So why are chromosomes abnormal?

If there is a chromosomal abnormality. This is generally related to congenital development. That's what you said about smoking. These drinking may be related. There is another possibility. This situation may also occur due to a genetic factor. So in this case. I personally recommend that you go to the hospital for a genetic check-up.

You must pay attention to the question of why chromosomal abnormalities occur. You mentioned why chromosomal abnormalities occur and the answer is as follows. There are many harmful effects of smoking, but the reason why smoking affects fertility is that nicotine can kill sperm and cause infertility, and it also affects the secretion of male hormones and thus affects the quality of sperm. Guidance: A large number of free radicals are indeed generated after cigarettes burn, and free radicals do react with cell membranes and proteins to cause DNA breakage, so they are very harmful to health.

Human genetic material exists on forty-six chromosomes in the cell nucleus, containing all human genetic genes. Each person's various characteristics, including appearance, physiological characteristics and diseases, are passed on to the next generation through the chromosomes in the reproductive cells. Because reproductive cells may be damaged and affected by harmful factors in the environment, abnormalities in the number and structure of chromosomes may occur, such as partial chromosome deletion, translocation, breakage, etc., which increases the probability of birth defects.

Given the high incidence of fetal chromosomal abnormalities, non-invasive DNA prenatal testing in Hong Kong has become the only choice for mothers of second children. This technology can be performed during pregnancy, provided that the embryo length is 33mm and the pregnancy is 8 weeks or above. A small amount of venous blood is drawn from the pregnant woman and fetal free DNA is extracted from it to detect whether the fetus is at risk of chromosomal abnormalities. Compared with the non-invasive method in mainland China, it is earlier, safer and covers comprehensive inspection items.