Complete, Incomplete & Co-Dominance

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Presentation transcript:

Complete, Incomplete & Co-Dominance Genetics After Mendel Complete, Incomplete & Co-Dominance

Complete Dominance (Mendel) Review: Alleles are what code for physical traits Some alleles are dominant over other alleles (recessive), and therefore suppress their expression An individual has 3 possible genotypes: homozygous dominant : heterozygous : homozygous recessive And 2 possible phenotypes: Dominant : Recessive

Examples of Complete Dominance Genotypes Patterns in F1 and F2 generations?

Examples of Complete Dominance F3 generation . . . Anything is possible!

Incomplete Dominance Incomplete dominance is a form of intermediate inheritance in which one allele for a specific trait is not completely dominant over the other allele. This results in a third phenotype in which the expressed physical trait is a combination of the dominant and recessive phenotypes.

Examples of Incomplete Dominance Let R= Red Let W= White Offspring phenotype are a blend of the two alleles; genotype? Patterns in F1 and F2 generation?

Codominance A condition in which both alleles of a gene pair in a heterozygote are fully expressed, with neither one being dominant or recessive to the other Similar to incomplete dominance as it results in three phenotypes and three genotypes

Examples of Codominance Cb Cr CrCb Let Cb= blue colour Let Cr= red colour Would there be any patterns in the F1 and F2 generation?

Examples of Codominance Shorthorn Cattle