Traditional Culture Encyclopedia - Traditional virtues - (20 14? Students of Songjiang district biology research group investigate human genetic diseases in a certain area. After the investigation, a species was found statistically.
(20 14? Students of Songjiang district biology research group investigate human genetic diseases in a certain area. After the investigation, a species was found statistically.
(2)① Family investigation showed that onychomycosis was passed down from generation to generation. The onychomycosis is dominant, the third father suffers from B disease, and the daughter is normal, which is recessive inheritance of X chromosome. The genotype of III-2 is12aaaxbxbxb or12aaaxbxbxb.
② the genotype of iii-1is AaXBY, and the probability of boys suffering from both A disease and B disease is12×18, and the probability of boys suffering from A disease but not B disease is12× (12+66).
So the answer is:
(1) on autosome and x chromosome? The number of male and female patients with disease A is basically the same, and the number of male patients with disease B is more than that of female patients.
(2)①aaXBXB or aaXBXB? ② 1838
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