Incomplete Dominance & Codominance, Exams of Genetics

Download Incomplete Dominance & Codominance and more Exams Genetics in PDF only on Docsity!

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!