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“患病男孩”意思是指在子女中既是患病又要是男孩的,是在所有子女中来求概率;“男孩患病”意思是指在男孩当中是患病的,只在男孩中来统计患病概率。1患病基因在X染色体(指X、Y的非同源段)上控制某遗传病的基因在性染色体上,该遗传病就与性别相关联。在计算患病概率时,因基因就在性染色体上,写出来的基因型可直接知道性别,若是求患病男孩,应在所有孩子中来统计患病概率(表1);若是求男孩患病,就是男孩中的患病概率,只能是在男孩中
“Sick boy ” means that both children are sick and boys, is to find the probability of all children; “boy sick ” means that among the boys is sick, only in Boy in the statistical probability of illness. 1 disease genes in the X chromosome (X, Y non-homologous segments) to control a genetic disease in the gene on the sex chromosome, the genetic disease associated with gender. In calculating the probability of illness, because the gene is on the sex chromosome, the genotype can be written directly to know the gender, if the boy is sick, the probability of illness should be counted in all children (Table 1); if the boy Illness is the probability of illness in a boy, only in boys