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Incomplete Dominance & Codominance, Exams of Genetics

A cross between organisms with two different phenotypes produces offspring with has both phenotypes of the parental traits shown. contribute to the phenotype.

Typology: Exams

2021/2022

Uploaded on 09/27/2022

goldr4k3
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Incomplete Dominance &

Codominance

Section 11-3 in Book

Exceptions to Mendel’s principles

 POLYGENIC TRAIT

 Sometimes, a trait is controlled

by many genes

 Ex. Hair color, eye color, skin

color, Height

Exceptions to Mendel’s principles

 MULTIPLE ALLELES

 Sometimes, a trait has more

than 2 versions of a gene

 Blood Type (A,B, O)

1. Incomplete Dominance

Examples:  Trait: Flower Color Expressions: Red x White  Pink RR= Red; RW= pink; WW= white  straight hair, wavy, curly

Incomplete Dominance

2. Codominance

 Both alleles contribute to the phenotype. Example: In come chickens Black Chicken x White  Speckled Chicken

YOU tell me which type of

dominance…

Type of

Dominance?

Type of

Dominance?

Incomplete Dominance!