求一道数学概率题
MenhaveXYor(YX)chromosomesandwomenhaveXXchromosomes.X-linkedrecessivegeneticdiseases(suchasjuvenileretinoschisis)occurwhenthereisadefectiveXchromosomesthatoccurswithoutapairedXchromosomethatisgood.Inthefollowing,representadefectiveXchromosomewithlowercasex,soachildwiththexYorYxpairofchromosomeswillhavethedisease,whileachildwithXXorXYorYXorxXorXxwillnothavethedisease.Eachparentcontributesoneofthechromosomestothechild.
a.IfafatherhasthedefectivexchromosomeandthemotherhasgoodXXchromosomes,whatistheprobabilitythatasonwillinheritthedisease?
b.IfafatherhasthedefectivexchromosomeandthemotherasgoodXXchromosomes,whatistheprobabilitythatadaughterwillinheritthedisease?
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