试题与答案

图表示人的耳垂性状(已知控制有耳垂的显性基因为A)遗传图解,请据图分析回答: (

题型:读图填空题

题目:

图表示人的耳垂性状(已知控制有耳垂的显性基因为A)遗传图解,请据图分析回答:

(1)正常情况下,人的体细胞中染色体上的基因是_________(填成对或单一)存在的。

(2)该对夫妇所生子女中,性状表现为有耳垂的机率是________%。

(3)假设a为隐性致病基因,请利用上边遗传图解,解释近亲不能结婚的原因________________________________________________。

答案:

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参考答案:A, B, D, E

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