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一、双杂合子的基因位置关系1.问题现有两对等位基因A、a和B、b,分别控制两对相对性状。对于基因型为AaBb的个体来说,这两对基因在染色体上的位置关系有几种情况?2.策略此问题是本节课的线索,而且思维跨度较大,刚抛出来,学生觉得有一定的难度,所以先引导学生独立思考,再进行小组交流讨论,最后由小组将交流的结果进行黑板展示。3.结果情况一:A、a和B、b这两对基因位于两对同源染色体上;情
First, the two heterozygous genetic relationship 1. Problem Existing two pairs of alleles A, a and B, b, respectively, to control two pairs of relative traits. For individuals with a genotype of AaBb, what are the loci of the two pairs of genes on the chromosome? 2. Strategies This question is clues to this lesson, and the thinking span is large, just threw, and students feel there is A certain degree of difficulty, so first guide students to think independently, and then exchange and discuss the group, and finally by the group to exchange the results of the blackboard display. 3. Results Case 1: A, a and B, b These two pairs of genes are located on two pairs of homologous chromosomes;