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近几年的上海高考生物试题中均有遗传病系谱图题型出现,其中的概率计算往往得分率最低,下面以下题为例,谈谈遗传病系谱图题型中概率计算的方法和技巧: 例题 为了说明近亲结婚的危害性,某医生向学员分析讲解了下列有白化病和色盲两种遗传病的家族系谱图。设白化病的致病基因为a,色盲的致病基因为b。请回答:
In recent years, there are genetic disease spectrogram questions in the Shanghai college entrance examination biology test questions. The probability scores are often the lowest. The following questions are taken as examples to discuss the methods and techniques of probability calculation in the genetic disease spectrogram questions: Examples In order to illustrate the dangers of consanguineous marriage, a doctor explained to the students the family genealogical maps of the following hereditary diseases: albinism and color blindness. Assume that the causative gene for albinism is a, and the disease-causing gene for colorblindness is b. Please answer: