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CH3BookNotes - Traits IncompleteDominance o

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Traits If obeyed Mendel’s laws then they were determined by a single gene  with alternative alleles clear cut for dominance and recessive Multifactorial- determined by 2 or more factors Extensions to Mendel for Single Gene Inheritance Incomplete Dominance o Hybrid doesn’t resemble either pure breeding parent o Intermediate phenotype o Not one allele dominant or recessive o Phenotypic ratios exact to genotypic ratios o F1- all mixed (hetero), F2- 1:2:1 Codominance o No dominant or recessive o Express both alleles in offspring o F2- 1:2:1 o Phenotype and genotype ratios match o Alleles often codominant for phenotypes expressed at molecular  level Dominance type depends on kinds of proteins determined by the  alleles and the biochemical function of those proteins in the cell o Don’t affect segregation of alleles during gamete formation Most traits have more than 2 alleles
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CH3BookNotes - Traits IncompleteDominance o

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