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-----Glue this page into your notebook----- Name___________________________________ Genetics Part 2: Incomplete & Codominance Classic Dominance: (aka “___________________ dominance”) the _______________________ displays the _______________________ phenotype Ex) Purple Flower (PP) x White Flower (pp) Purple Flower (Pp) Incomplete Dominance Incomplete Dominance: occurs when offspring have a phenotype that is ________________________ the two parent phenotypes. - Heterozyote displays a _______________ phenotype (dominant no longer masks recessive!) EXAMPLE: Four O’ Clock Flowers Find the phenotypes for the following genotypes and use them to complete the Punnett squares below. Genotype RR Phenotype rr Rr Square 1: Cross Rr with Rr Square 2: Cross RR with rr Square 3: Cross RR with Rr Genotypic Ratio: ______________ Genotypic Ratio: ______________ Genotypic Ratio: ______________ Phenotypic Ratio: Phenotypic Ratio: Phenotypic Ratio: ____________________________ ____________________________ ____________________________ -----Glue this page into your notebook----- CODOMINANCE FILL-IN NOTES X CODOMINANCE: = both alleles are ____________ in a heterozygote. Neither allele is ____________________________________ Both show up in the ________________________. There is no ___________________________ like in incomplete dominance. Examples: ___________________________________________________________________________ SPECIAL CASE! How to write genotypes for codominant alleles Notation: Use with codominance only Example: Codominance in cow coat colors WRITE IN WHAT THE LETTERS REPRESENT CR CODOMINANCE EXAMPLE: Roan Coat Color in Cattle Genotype Phenotype Show a cross between a red bull and a roan cow. (write the parent genotypes on the line below) ______________ X ______________ Genotypic ratio: ________________________________ Phenotypic ratio: ________________________________________ CODOMINANCE EXAMPLE: Blood Types There are ____ alleles for blood genotypes: _____, ______, ______ There are 4 blood phenotypes: _____, _____, _____, _____ _____ and _____ are codominant; both are expressed in type AB blood. Type _____, which has genotype _____ is recessive to both _____ and _____. You aren’t done yet! Be sure to copy the Blood Type Example into your notebook and do your summary! Genotype Phenotype IAIA or IAi Type _______ IBIB or IBi Type _______ ii Type _______ IAIB Type _______
