(2019·广东清远期末)如图为某种单基因遗传病的遗传系谱图,其中Ⅱ3

(2019·广东清远期末)如图为某种单基因遗传病的遗传系谱图,其中37均携带致病基因。下列相关判断正确的是(  )

A.该病为常染色体隐性遗传病或伴X染色体隐性遗传病

B46为杂合子的概率均为

C34再生一个孩子,患病的概率为

D8产生的配子中携带致病基因的概率为

答案

 C

解析 67正常,生出患病孩子9,又7携带致病基因,故该病为常染色体隐性遗传病,A项错误;设相关基因用Aa表示,4的基因型及概率为AAAa6的基因型为AaB项错误;3的基因型为Aa4的基因型及概率为AAAa,他们再生一个孩子患病的概率为×C项正确;由以上分析可知,8的基因型及概率为AAAa,其产生的配子中携带致病基因的概率为×D项错误。

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