What causes trisomy 21

summary

Many people don't know what trisomy 21 is. But when it comes to Down's or congenitally stupid children, we all know that trisomy 21 is a genetic defect. The intelligence of children with trisomy 21 is lower than that of normal children, and their intelligence quotient is usually only about half that of normal children. Moreover, the development of children with Down's is relatively slow and their muscles are very tense, so their learning and walking are worse than normal children, Now let's take a specific look at how trisomy 21 is caused.

What causes trisomy 21

Reason 1: most of trisomy 21 are newborns, which has nothing to do with their parents' chromosomal nuclei. It is mainly related to the process of embryonic development, which has a great relationship with the quality of women's eggs. The older a woman is, the older the eggs are, and the more difficult it is to separate them.

Reason 2: some of them are related to heredity. If the couple has given birth to a Down's baby, then it's better to do a chromosome test at this time, so as to eliminate the genetic factors, so as to make a certain reference for the next pregnancy. In addition, during pregnancy, it's also necessary to reduce the exposure to radiation.

Reason 3: in addition, there are many medical methods to detect Down's syndrome during pregnancy. Combined with the age and gestational weeks of pregnant women, if the fetus with Down's syndrome is calculated abnormally, amniocentesis should also be performed. Therefore, women are required to do a good job of pregnancy examination during pregnancy.

matters needing attention

Through the above introduction, we must have a more comprehensive understanding of trisomy 21. Trisomy 21 is a common defect based disease in our life, so pregnancy examination becomes very important.