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遗传概率问题,灵活性很强,在高考中常考常新.笔者从多年的教学实践和高考反馈的情况来看,此类题得分率很低,究其原因,学生对遗传定律的应用缺乏灵活性,对遗传定律概率的计算缺乏解题技巧.题目(海淀2014届高三理综冲刺卷一第31题)小鼠的眼色有红眼、杏红眼、白眼三种,且由两条常染色体上的两对等位基因控制,其中M_nn为红眼,M_Nn为杏红眼,其他基因型为白眼,现有MmNn两只雌雄鼠杂交,产下F1代小鼠,再让F2
Genetic probability problem, a strong flexibility in the college entrance examination often test new.The author from many years of teaching practice and college entrance examination feedback point of view, such questions score very low, the reason, the students lack of flexibility in the application of genetic law Sex, the calculation of the probability of genetic law, the lack of skills to solve the problem. (Haidian 2014 Trinity high spiking volume a 31) mouse eyes red-eye, apricot red-eye, white-eye three, and by the two autosomal Two pairs of allele control, including M_nn red-eye, M_Nn red almond eyes, other white-eye, the existing MmNn male and female of two hybrids, giving birth to F1 mice, let F2