Non-Mendelian Genetics: Incomplete Dominance, Codominance, Multiple Alleles, Slides of Biology

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NonMendelian Genetics

Incomplete Dominance - inheritance pattern in which one allele is not completely dominant over the other allele

• Example: RR – red snapdragons WW – white snapdragons RW –

Incomplete Dominance

Codominance - inheritance pattern where both alleles contribute to the phenotype of the organism

• Example: CBC B^ x CWC W black chicken white chicken

Multiple Alleles - presence of more than two alleles for

a given trait.

 Example: human blood type  Gene is written as an I and has three alleles (I A^ , I B, i)  IA^ and IB^ are codominant, i is recessive.

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Figure 14-

(Blood Type)^ Phenotype Genotype^ Red Blood Cell^ Antigen on^ Safe Transfusions To From

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If a man with type AB blood marries a woman with type O blood, what are the possible genotypes and phenotypes for the children’s blood?

Sex-linked Trait Problem

Color-blindness is an X-linked recessive trait. Determine the genotypic and phenotypic ratios of a cross between a woman who is a carrier for color blindness and a man with normal color vision. Show all of your work.

Female Carriers