median genetics 2 - DIHYBRID CROSSES Mendel's Second Law...

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DIHYBRID CROSSES Mendel's Second Law, Principle of Independent Assortment:(non-homologous chromosomes) F2 results: phenotypes and genotypes (if on non-homologous chromosomes) seed form and seed color P round, yellow R/R Y/Y X wrinkled, green r/r y/y Genotypes R/R Y/Y r/r y/y gametes: F1 phenotypes: genotypes: gametes: genotypes R/R Y/y R/r Y/Y R/r Y/y R/R Y/Y r/r Y/Y r/r Y/y R/R y/y R/r y/y r/r y/y Note new non-parental combinations (wrinkled, yellow and round, green) What happens if the genes are on homologous chromosomes (= linked)
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Unformatted text preview: If we do the same dihybrid cross we did above RY/ry X RY/ry gametes RY or ry only Note notational difference Observation: no new non-parental combinations phenotypic ratio: 3 smooth, yellow : 1 wrinkled, green PRODUCT LAW the chance that a number of independent events will occur together is equal to the product of the chances that each will occur separately. Simply multiply the independent probabilties...
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