It s a genetic disease that will definitely die, but it s the same as a normal person when it doesn

AIDS. Although it is not considered a genetic disease.

But it's basically hereditary.

a. Congenital diseases are not necessarily caused by the genetic material of the disease, so they are not necessarily hereditary, and acquired diseases may also be hereditary diseases, a mistake;

b. Familial diseases are not necessarily hereditary, they may be infectious diseases, sporadic diseases may also be hereditary diseases, and b. errors;

c. Genetic diseases refer to human diseases caused by changes in genetic material, which can be affected by environmental factors to varying degrees, c. Correct;

d. Genetic diseases are not infectious diseases, d are wrong

Therefore, c

According to the figure analysis:

1. The mother has a pathological gene, but the son does not show symptoms, which means that it is not a companion inheritance on the X chromosome. Here's why.

If it is caused by the recessive gene on x, the mother must have a pair of recessive genes, and the son should show the disease;

If the dominant gene on the X chromosome causes the disease, it is difficult for the children to be disease-free;

2. This gene will not be an autosomal dominant gene. The reason is that none of the children have gotten this gene. This is too unlikely.

In summary, this gene is most likely an autosomal recessive pathogenic gene.

Agree with the second answer, it's complete.

It may be a dominant gene on the X chromosome, with the mother being Xaxa, the father being Xaya, and the child possibly Xaya, Xaxa. If it is a biological question, it is best to choose and cannot be judged, of course, autosomal recessive inheritance is more likely.

If the mother is sick and the son is normal, it can be determined that it is not a genetic disorder controlled by a recessive gene on the X chromosome. It is possible to be hidden, often visible, and x-visible.

My grandfather was sick and my mother was not sick, indicating that the disease was often infected with Bai chromosome recessive du

Genetic disease or with zhix recessive genetic DAO disease or with Y genetic disease.

If it is accompanied by a Y genetic disease, the probability of the son getting the disease is 0

If it is autosomal inheritance, then the family tree can be written as: grandfather aa, mother must be aa, then the probability of inheritance to the son depends on the genetic type of the child's father, which is 0 (father: aa) or 1 4 (father:

aa), or 1 2(Father: AA).

If the X chromosome is inherited, then the grandfather is (xay) and the mother is (xaxa), then the probability of the son getting the disease must be 1 2

Did you say that the father was remarried?

Let the grandfather's gene be the system RR, because the mother is dominant, so it is RR, and the father DU has three possibilities: RR, RR, and RR

1) RR and RR - no probability DAO in the four cases (2) RR and RR - 1 time in the four cases.

3) RR vs. RR – 2 times out of four cases.

There are 12 situations in total, and 3 situations will get genetic diseases, so the probability is 3 12 * 100% = 25%.

Hereditary blindness.

Is it autosomal recessive?

Did you say father?

Let the grandfather's gene be RR, because the mother is dominant, so it is RR, and the father has three possibilities: RR, RR, and RR

1) RR and hungry sedan RR - no probability in the four cases.

2) RR vs. RR – 1 of the 4 recapitulation situations.

3) RR vs. RR – 2 times out of four cases.

There are 12 situations in total, and 3 situations will get genetic diseases, so the probability is 3 12 * 100% = 25%.

It depends on whether it is caused by an accident or an illness, and it will not be as suspenseful as the god family in "Fengyun".