Why can't close relatives get married? If it's just because genes affect the next generation, then don't have children.

China (not only China, but also most countries in the world) forbids consanguineous marriage. The main reason is that people themselves have genetic defects, and close relatives are more likely to have the same defects, which will seriously affect the quality of the next generation.

Of course, this kind of harm is mainly reflected in the next generation. Not having children can solve this problem, but the law does not allow it. Secondly, families without children have a lot less fun.

What is the risk of offspring who are not closely related to each other 1/500? ×? 1/500? ×? 1/4? =? 11000000 (one in a million); ?

What is the risk of second cousin's married offspring 1/500? ×? 1/64? ×? 1/4? =? 1/ 128000?

What is the risk of the offspring of first cousin marriage 1/500? ×? 1/ 16? ×? 1/4? =? 1/32000?

What is the risk of the offspring of brother and sister marriage 1/500? ×? 1/4? ×? 1/4? =? 1/8000?

Compared with non-consanguineous marriage, the risk of second-degree relatives increased by 7.8 times; The risk of first-degree relatives increased by 3 1 times; The risk rate of sibling marriage is 125 times that of normal random marriage!