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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
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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!