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Download patterns of heredity - biology
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CHP. 10 INCOMPLETE DOMINANCE • An individual displays a trait that is • • • intermediate between the two parents. Neither allele is completely dominant Ex: red vs. white = pink Hair texture: straight vs. curly = wavy CODOMINANCE • Equal expression of both alleles • Ex: Type AB blood POLYGENIC INHERITANCE • Inheritance pattern of a trait that is controlled by 2 or more genes • Can be on the same chromosome or different ones • Ex: eye color, skin color, height ENVIRONMENTAL INFLUENCES • Internal environment- age, gender • can affect gene function, hormones, structural differences External environment- temperature, nutrition, light, chemicals, infection SELECTIVE BREEDING • Produces organisms with desired traits (dogs, horses) • Eliminate undesired traits by • inbreeding (mating closely related individuals), keeps a pure line Testcross- cross of an individual of unknown genotype with an individual of known genotype Carrier- heterozygous, looks like a homozygous dominant individual HYBRIDS • Mating of closely related species • The offspring are sterile • Rarely happens in nature • Ex: Liger (lion x tiger) Wolfdog Wolphin Zeedonkey Grolar bear CAMA
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