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阿Q吧 > 牛的黑毛和棕毛是一对相对性状，并且黑毛（B）对棕毛（b）是显性。这句话怎么理解？

牛的黑毛和棕毛是一对相对性状，并且黑毛（B）对棕毛（b）是显性。这句话怎么理解？

2025-03-31 07:55:39

推荐回答（2个）

回答1：

这句话意思就是说.黑毛与棕毛都是说毛的颜色.比如.长毛对短毛.说的是毛的长度.而黑色(B)对棕色(b)为显性.就是当B基因存在时表现的是显性性状.也就是黑毛.而b为隐性.显性对隐性有覆盖作用.只要有一个B基因存在.就表现为黑毛.只有全是b时.而B不存在时.才表现为棕毛.

回答2：

说的是基因遗传性状的问题。具体地说就是有一对基因B和b，控制了牛毛的颜色，B为显性基因，控制黑色性状，b为隐性基因，控制棕色性状。

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