一道SAT生物题 麻烦翻译 并且解答一下 谢谢A cattle breeder wanted a line of “pure breeding” roan cattle. Would it be possible to have such a line? Why or why not?

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一道SAT生物题 麻烦翻译 并且解答一下 谢谢A cattle breeder wanted a line of “pure breeding” roan cattle. Would it be possible  to have such a line?  Why or why not?

一道SAT生物题 麻烦翻译 并且解答一下 谢谢A cattle breeder wanted a line of “pure breeding” roan cattle. Would it be possible to have such a line? Why or why not?
一道SAT生物题 麻烦翻译 并且解答一下 谢谢
A cattle breeder wanted a line of “pure breeding” roan cattle. Would it be possible to have such a line? Why or why not?

一道SAT生物题 麻烦翻译 并且解答一下 谢谢A cattle breeder wanted a line of “pure breeding” roan cattle. Would it be possible to have such a line? Why or why not?
一名饲养员想要培育一批纯种繁殖的花毛牛.他能够得到这批花毛牛吗?为什么?
答案:不能.因为花毛牛是杂种后代,基因型为杂合子,符合孟德尔定律,在繁殖的过程中会发生显隐性分离,后代中不会全是花毛牛,所以不可能得到纯种繁殖的花毛牛.