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Genetics and Heredity Part III Every path has its puddle. English proverb

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Today’s Agenda Dihybrid crosses Incomplete dominance Codominance Polygenic

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Dihybrid SetUp PpSs X PpSs

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PS

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Dihybrid SetUp PpSs X PpSs PSPs

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Dihybrid SetUp PpSs X PpSs PSPs pS

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Dihybrid SetUp PpSs X PpSs PSPs pS ps

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Dihybrid SetUp PpSs X PpSs PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSS PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSs PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSS PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSs PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPss PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSs PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSS PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSs PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSS PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSs PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpss PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpssppSs PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpssppSsppss PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpssppSsppss PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpssppSsppss PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpssppSsppss PSPs pS ps PS Ps pS ps

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Dihybrid SetUp PpSs X PpSs PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpssppSsppss PSPs pS ps PS Ps pS ps

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9:3:3:1 PPSSPPSsPpSSPpSs PPSsPPssPpSsPpss PpSSPpSsppSSppSs PpSsPpssppSsppss PSPs pS ps PS Ps pS ps

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Obj. 9 Incomplete Dominance Definition: A condition in which a trait in an individual is intermediate between the phenotype of the two parents because the dominant allele is unable to express itself fully.

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Example of Incomplete Dominance: Red snapdragon X white snapdragon All offspring are pink snapdragons

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Codominance Definition: a condition in which both alleles for a gene are fully expressed. Ex. Blood Types

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Polygenic Definition: a characterisitc of an organisms that is determined by many genes Ex. Eye color, height, weight

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Multiple Alleles Genes with three or more alleles Example: Blood groups A = AO, AA B = BO, BB AB = AB O = OO

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Practice Problems

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