生物必修二遗传因子的发现（Biology required the discovery of two genetic factors）.docVIP

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生物必修二遗传因子的发现（Biology required the discovery of two genetic factors）.doc

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生物必修二遗传因子的发现（Biology required the discovery of two genetic factors）

生物必修二遗传因子的发现（Biology required the discovery of two genetic factors） The first section Mendels pea hybridization experiment (1) (1) discussion of the problem 1. pink. Because in the view of fusion inheritance, the parent genetic material is mixed in the offspring, and the offspring represent the intermediary character of parents, that is, the mixed color of red and white pink. 2. clew: this problem is open problem, the purpose is to guide the student to observe, analyse the biological heredity phenomenon around, the student passes the analysis of the genetic instance, discriminates whether the fusion genetic viewpoint is correct. Teachers may not give much explanation for the fact that some students may cite examples of multiple genetic factors that control biological traits (such as height of the human body). So long as guides the student to be able to ponder earnestly, discusses positively, puts into the study condition to be possible. (two) experiment Compared with 1. in each group of experimental results, the experimental results always closer to the expected results, the number of balls combination type than DD: Dd: dd=1: 2: 1, the dominant and recessive type numerical ball represents the ratio of 3: 1. Because the larger the number of individuals, the closer the statistical laws are. If Mendel was only the statistical results of 10 strains of pea hybrids, it is difficult to correctly interpret the character separation phenomenon, because the number of experimental statistical samples enough, is a prerequisite for Mendel to correct analysis of experimental results. When the individuals of 10 peas are counted, there will be greater errors. The results of 2. simulation experiments coincide with Mendels hypothesis. Because the ball Mendel experiment a and B in the keg of male and female gametes, from two barrels were randomly grab a ball combination, random combination in fact simulation of male and female gametes, the statistical number is large enough, there ar