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【求一道数学概率题MenhaveXYor(YX)chromosomesandwomenhaveXXchromosomes.X-linkedrecessivegeneticdiseases(suchasjuvenileretinoschisis)occurwhenthereisadefectiveXchromosomesthatoccurswithoutapairedXchromosomethatisg】
3人问答
更新时间:2024-03-29 21:13:45
问题描述:

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?

刘伟杰回答:
  a)Ason'sX(orx)mustbeinheritedfromhismom,hemusthaveXYorYX,theprobabilityis0,impossible.   b)AdaughtermusthaveXxorxXinthiscase,theprobabilityisalso0.   I'mnotgonnatranslatethewholepiece.SinceIcouldreadthroughandunderstandit,translatingisjustwastingmytime.Sorry.   Feelfreetoaskifyouhaveanyquestionorconcern.
陈晓钢回答:
  IfafatherhasthedefectiveXYchromosomeandthemotherhasgoodXxchromosomes,whatistheprobabilitythatasonwillinheritthedisease?:)
刘伟杰回答:
  1/2   BecauseTheX(orx)mustbeinheritedfrommother.   ThereforexYandXYhaveequalchancetooccurinthenextgeneration.
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