BIOL 3010 Lecture 18: Lecture 18
10 Oct 2016
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This is not crossing them to mutant, mutants can be dominant. Two types of dominance: molecularly homozygous or heterozygous. But if he self yy you"d get 3:1 ratio of yellow to green. Testcross: unknown dominant phenotype and *****homozygous recessive individual ----with this rec. indiv. Tester it will not hide any of the genotype of tested individual. Dihybrid: wrinkled/round yellow/green so if you look at just the color or just skin its just doing 2 different 3:1 ratio superimposed on another 3:1 ratio. 9:3:3:1 is the independent combination of the two 3:1 ratios. The farther apart genes are, it"ll look like independent assortment eventually. In producing these 4 phenotypic classes- resulted from equal possibilities of making each of the gametes from f1. From each f1 they will produce equal proportions of the 4 types of gametes - from law of independent assortment. With a trihybrid: 8 different phenotypic classes would occur.
