推荐回答（3个）
乙病是血友病，血友病是属伴性镇芦搭遗传，为伴X染色体隐性遗传，具有交叉遗传的特点，观察子2代3号，他的致病基因传给了他的女儿，符合这一特点。
另一种遗传病的致病基因在常染色体上，为隐性。根据‘无中生有为隐性，有中生无为显性’的判定原则，观察子2代3号和4号，亲本并没有甲病，而后代却出现了甲病，则哗蠢可判定甲病属隐性遗传病，若其属伴性遗传，则子3代的11号的父御拿亲必患甲病。
血友病遗传基因位于X染色体上， 母亲患病会遗传给儿子，女儿患病，则父亲一定也患病。从7、8生出的后代12、13来看，双亲没有患甲病，但后代都患了甲埋尘病，可以推断出甲病一定不是血友病，那么乙病就是血友病。
甲病首先不会是显性遗传，因为7、8不患甲病而后代患甲病；也不会是伴性遗传，因为5不患甲病但是女儿患了甲病皮液亩，所以甲病致病基因是在常染色燃森体上，为隐性遗传病。
希望我讲得足够明白了：）
乙病 血友培咐病伴X染色厅厅体隐性遗传 如果是甲病 因为三代10患病 则二代5一定会患病 矛盾 所以配伏纯为乙病
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