近年来生物问题用数学思维的越来越多,概括起来有两类,一类是用归纳法建 立数学模型,一类是用函数思维分析曲线之间的关系.本文着重讨论前一种. 先看例题: 例 让基因型为AABB和aabb的两品种杂交,在其F2中,选出表现型为Ab的 个体,让其连续自交5代,在选育过程中,每一代的表现型为ab的个体均被淘汰, 则在第5代中符合理想表现型的个体占杂合体的( ) In recent years, there are more and more mathematical problems in biological problems, and there are two general categories. One is to establish mathematical models using induction, and the other is to use functional thinking to analyze the relationship between curves. This article focuses on the former. To see the example: Let the two breeds with AABB and aabb genotypes hybridize. In their F2, select the individuals whose phenotype is Ab and let them continue to self-cross 5 generations. During the breeding process, the phenotype of each generation is Individuals with ab were eliminated, and those who met the ideal phenotype in the 5th generation were heterozygous ()