How high is the probability of inheriting low intelligence?

Patient's question:

The grandmother and uncle of his boyfriend are a bit mentally retarded, but his mother and other aunts are normal, his sister and he are also normal, and the child his sister gave birth to is also normal. How likely is it that this can be passed down to the next generation through generations? Concerned help: Can it be checked before pregnancy if it is pregnant, and can it be tested on the fetus during pregnancy if there is a generation-to-generation inheritance of this gene?

Doctor's answer:

According to what you said, intellectual disability can be inherited across generations, but it is not absolute—it may also be inherited after one or several generations. It is recommended to undergo prenatal examinations during pregnancy, in addition to various prenatal screenings, and to pay attention to maintaining a healthy pregnancy to avoid interfering with the intellectual development of the fetus. Additionally, in daily life, patients should balance their nutritional intake, engage in aerobic exercises to strengthen their bodies, and maintain a cheerful mood to enhance their physical condition and accelerate recovery.

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