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Unformatted text preview: flower colour Statistical Observations Character Traits crossed F1 F2 Ratio Seed shape Round x wrinkled All round 5474 round 1850 wrinkled 2.96:1 Seed colour Yellow x green All yellow 6022 yellow 2001 green 3.01:1 Pod shape Inflated x constricted All inflated 882 inflated 299 constricted 2.95:1 Pod colour Green x yellow All green 428 green 152 yellow 2.82:1 There was generally a 3:1 ratio among the phenotypes, and a 1:2:1 ratio of genotypes Explanatory Model-Variation in traits due to different alleles-Organisms inherit two alleles for each trait-Dominant alleles determine the appearance of heterozygotes-Alleles segregate randomly into gametes Probability -The randomness inherent in chromosome segregation at meiosis allows probability theory to predict the outcome of crosses -A dihybrid cross of two genes with two alleles each will give a 9:3:3:1 ratio overall...
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- Spring '09