英语翻译Imagine that a newly discovered,recessively inherited disease is expressed only in individuals with type O blood,although the disease and blood group are independently inherited.A normal man with type A blood and a normal woman with type

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英语翻译Imagine that a newly discovered,recessively inherited disease is expressed only in individuals with type O blood,although the disease and blood group are independently inherited.A normal man with type A blood and a normal woman with type
英语翻译
Imagine that a newly discovered,recessively inherited disease is expressed only in individuals with type O blood,although the disease and blood group are independently inherited.A normal man with type A blood and a normal woman with type B blood have already had one child with the disease.The woman is now pregnant for a second time.What is the probability that the second child will also have the disease?Assume that both parents are heterozygous for the gene that causes the disease.

英语翻译Imagine that a newly discovered,recessively inherited disease is expressed only in individuals with type O blood,although the disease and blood group are independently inherited.A normal man with type A blood and a normal woman with type
假设一个新发现的隐性遗传病仅在O型血的人群中发病,虽然这种疾病和血型是独立遗传.现在一个正常的A型血男纸和一个正常的B型血女纸已经有了一个得该种病的孩纸.这个女纸又怀孕了,那么第二个孩纸得这种病的概率是多少?假设这对男女该疾病基因都是杂合.
应该是1/16.解释：现以D,d表示这对疾病的显隐性基因,A,B,i表示血型基因.这种独立于血型遗传的隐形疾病仅发生在O型血,就是说即使该疾病基因是隐性纯和,在A,B,AB血型中都不表现出来.已知该对A,B型血的男女第一个孩纸病了,则该孩纸的基因应该是ddii,那么该对男女肯定Ai,Bi血型基因,才可能产生O型血孩纸.所以他们再生一个O型血孩纸的概率是1/4,又知道他们该疾病基因都是杂合,他们他们再生一个纯和dd的概率也是1/4,由于疾病和血型独立遗传,则独立事件共同发生的概率是两独立事件单独发生的概率之积,所以再生一个孩纸得病的概率是(1/4)*(1/4)=1/16.
孩纸,你明白了吗?

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