有耳垂和无耳垂是一对相对性状.有耳垂是显性由显性基因控制无耳垂是隐性由隐性基因控制.现有一对夫妇都是有耳垂的但却生下一个无耳垂的儿子 Template




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tomski有耳垂和无耳垂是一对相对性状.有耳垂是显性由显性基因控制无耳垂是隐性由隐性基因控制.现有一对夫妇都是有耳垂的但却生下一个无耳垂的儿子 coloring