一道SAT生物题 请翻译一下 并且解答一下 谢谢Karen and Steve each have a sibling with sickle-cell disease. Neither Karen nor Steve nor any of their parents have the disease, and none of them have been tested to reveal sickle-cell trait
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一道SAT生物题 请翻译一下 并且解答一下 谢谢Karen and Steve each have a sibling with sickle-cell disease. Neither Karen nor Steve nor any of their parents have the disease, and none of them have been tested to reveal sickle-cell trait
一道SAT生物题 请翻译一下 并且解答一下 谢谢
Karen and Steve each have a sibling with sickle-cell disease. Neither Karen nor Steve nor any of their parents have the disease, and none of them have been tested to reveal sickle-cell trait. Based on this incomplete information, calculate the probability that if this couple has a child, the child will have sickle-cell disease.
一道SAT生物题 请翻译一下 并且解答一下 谢谢Karen and Steve each have a sibling with sickle-cell disease. Neither Karen nor Steve nor any of their parents have the disease, and none of them have been tested to reveal sickle-cell trait
karen和steve都有一个患病（sickle-cell ）的兄弟姐妹.但是他们和他们的父母都不患该病,但是他们都没有做过相关的测试.基于上面的信息,计算他们孩子患病的几率.
1、该病是常染色体的隐性基因控制的.他们都有患病的姊妹,但是父母都不患病.所以他们的父母都是Ss的基因型.
2、他们的基因型都有可能是Ss或者SS.
3、孩子要患病必须是ss,所以必须从男方和女方各获得一个s,那么因为男方和女方基因型不明确,他们提供s的可能性都为1/4,所以孩子患病几率为1/4x1/4=1/16