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Anonymous users2024-02-11We know. 1 The husband's brother and the wife's sister both have aa genotypes, so the husband's parents and the wife's parents have both aa2 genotypes, and the parents who are normal in order to give birth to a patient with meluria are aa, so it can be seen. Both husband and wife should be genotype AA
3 The probability that they are both aa is 4 9 Because the probability of one being aa alone is 2 3, so aa is born
The probability is 4 9 * 1 4 = 1 9
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Anonymous users2024-02-10First of all, we know that meluria is a genetic disease caused by a single recessive pathogenic gene.
The husband and wife are in the same family situation, and they all have relatives with this disease. Therefore, the genetic situation of both husband and wife is the same.
Denoted by a, a. The husband and wife have AA parents, so since neither of them is sick, the probability of having genes AA is 1 3 and AA is 2 3It is impossible for one of the spouses to be the offspring of AA, so only AA can get sick.
Therefore, it is a cross of 2 3 for AA, and 3 genotypes are obtained, AA 1 4, AA 2 4, AA 1 4, and the affected child who gets AA is 2 3*2 3 of AA and multiplied by 1 4 of AA to get 1 9
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Anonymous users2024-02-09The question is a little less conditional, and it is better to say that the parents of the couple are normal, in this case, the result is 1 9.
If one of the husband's parents is sick and one of the wife's parents is sick, then the result is 1 4.
If the husband's parents are normal and the wife's parents are sick, the result is 1 6.
If one of the husband's parents is sick and the wife's parents are normal, the result is 1 6.
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Anonymous users2024-02-08In the case of independent inheritance, multiple pairs of traits are decomposed into a single relative trait, and then analyzed separately according to the law of gene segregation, and finally the analysis results of each pair of relative traits are multiplied, which is based on the multiplication theorem in probability theory.
The multiplication theorem is that if the occurrence of one event does not affect the occurrence of another, the probability that the two events will occur at the same time is equal to the product of the probability of their separate occurrence.
The law of free combination of genes involves the independent inheritance of many pairs of genes, therefore, according to the multiplication theorem in probability theory, the performance of multiple pairs of genes is the product of the performance of each of the equivalent genes when they are inherited separately.
Six ways to calculate the probability of biological inheritance.
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If not a problem. It's just that I think the concept and understanding are more important. Due to the number of words, it is a little troublesome to write. So I still don't write it.
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