推荐回答(1个)
隐性基因的影响 初中生物就有讲过。
用数学来讲 就是显性基因是0 隐性基因是1 人有2个基因相乘 得到什么 生出来就表现出什么样子 比如父母俩人 基因都是1和0 1*0=0 所以他们都是显性的 没有狐臭,
而你取他们俩人分别一半的基因组合有4个可能 1*1 1*0 0*1 0*0 而你正好是1*1=1 那么就会跟他们不一样会有狐臭
当然也有可能是洗澡不勤快而已
建议你看看下面介绍
在遗传中,基因都是成对组合遗传的,孩子的基因是由父亲一方的一条基因链和母亲一方的一条基因链组合而成的,两条基因链重新组合配对,从而复制发育长大。而在配对过程中,就存在两种情况,一种是杂合子,一种是纯合子。所谓杂合子,就是说由两种不同基因组合而成的,比如从父亲一方得到的是A基因,而从母亲一方得到的是a基因,配对后就是Aa组合,这种组合就是杂合子。而纯合子从父母双方来的基因都是一样的,要么都是A,要么都是a,也就组合成AA或aa,这两种就是纯合子
遗传影响
基因中又有显性和隐性之分,一般来说,最终能看到的特征是显性基因表达的结果,而看不到的是隐性基因表达的结果。纯合子的基因要么是双显性要么是双隐性,比如用大写表示显性,小写表示隐形,那么AA组合的纯合子就是双显性纯合子,而aa组合就是双隐性的纯合子。而一个大写和一个小写组合的Aa就是杂合子,而在杂合子中,表现出来的是哪种特征就说明哪种基因占上风。一般来说,显性基因是占上风的。比如单眼皮、双眼皮特征,属于杂合子类型,孩子如果是双眼皮,只要父母中有一个人是双眼皮就可以了,不需要父母双方都是双眼皮,因为表现为双眼皮的显性基因A(只是用A打比方)占上风,组合中只要有A就可以是双眼皮,除非孩子遗传到的是双隐性的aa基因,才是单眼皮特征。这就是显性基因的“优先权”。
http://baike.baidu.com/link?url=FVs8epfxjdQnh_838tbQRoeCLzsdT92s3zhpxEdoxrey3nY6RjANOEuphYdT4UauSQWbn8e2jcHtokEH_fNY_KGgZOCe3tpILjC2ZO7aqOuRRz3sTAfiduifQ5xU3T7h
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