生物遗传病概率计算 生物遗传学概率计算有什么技巧
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\u3000\u30002\uff0e\u52a0\u6cd5\u539f\u7406\uff1a
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\u3000\u3000\u4e09\u3001\u5229\u7528\u4e0d\u5b8c\u5168\u6570\u5b66\u5f52\u7eb3\u6cd5
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\u4f8b\u98985\uff08\u540c\u4e0a\u4f8b\u98984\uff09\uff1a\u89e3\u6790\uff1a\uff081\uff09\u636e\u9898\u610f\u5206\u6790\uff0c\u5148\u63a8\u5bfc\u51fa\u53cc\u4eb2\u7684\u57fa\u56e0\u578b\u4e3aTtAa\uff08\u7236\u4eb2\uff09\uff0cttAa\uff08\u6bcd\u4eb2\uff09\u3002\u636e\u5355\u57fa\u56e0\u5206\u6790\u6cd5\uff08\u6bcf\u5bf9\u57fa\u56e0\u5355\u72ec\u5206\u6790\uff09\uff0c\u82e5\u4ed6\u4eec\u518d\u751f\u80b2\u540e\u4ee3\uff0c\u5219Tt\u00d7tt\u21921/2Tt\uff0c\u5373\u591a\u6307\u7684\u6982\u7387\u662f1/2\uff1bAa\u00d7Aa\u21921/4aa\uff0c\u5373\u767d\u5316\u75c5\u7684\u6982\u7387\u662f1/4\u3002\uff082\uff09\u751f\u4e0b\u4e00\u4e2a\u5b69\u5b50\u540c\u65f6\u60a3\u4e24\u79cd\u75c5\u7684\u6982\u7387\uff1aP\u591a\u6307\uff081/2Tt\uff09\u53c8\u767d\u5316\uff081/4aa\uff09=1/2\u00d71/4=1/8\uff08\u4e58\u6cd5\u539f\u7406\uff09\u3002\uff083\uff09\u751f\u4e0b\u4e00\u4e2a\u5b69\u5b50\u53ea\u60a3\u4e00\u79cd\u75c5\u7684\u6982\u7387=1/2 +1/4\u20141/8\u00d72=1/2\u62161/2\u00d73/4+1/4\u00d7 1/2=1/2\uff08\u52a0\u6cd5\u539f\u7406\u548c\u4e58\u6cd5\u539f\u7406\uff09\u3002 \u2477\u751f\u4e0b\u4e00\u4e2a\u5b69\u5b50\u60a3\u75c5\u7684\u6982\u7387=1/2 +1/4\u20141/8\u00d71=5/8\uff08\u52a0\u6cd5\u539f\u7406\u548c\u4e58\u6cd5\u539f\u7406\uff09\u3002\u6b63\u786e\u7b54\u6848\uff1aA
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于是，当是Aa时，有1/4*1/2概率生一个患病男孩，当是AA时，没可能
就有2/3*1/4*1/2=1/12
父亲有1半可能是Aa或者AA，当为Aa时，有4分之一可能有病小孩，就是8分之一是病的男孩，当为父亲AA时，不可能有病小孩。所以答案为16分之一
如果父亲是AA的话，孩子肯定没有患病的，因为是隐性遗传
如果是Aa的话，生一个患病的孩子概率是1/4，还是男孩，那概率应该是1/8
父亲是Aa的概率是1/2
而Aa（父亲）与Aa（母亲）生出aa（患病男孩）的概率是1/4
所以他们生一个患病男孩的概率是1/2*1/4=1/8。
父：AA Aa- A A A a
母：Aa - A a
AA - 3/8
Aa - 1/2
aa - 1/8
男孩机率 1/2
所以机率=1/2×1/8/1=1/16
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