Download Incomplete Dominance Codominance

Incomplete Dominance
________________ Dominance: The __________________
genotype produces a ________________ that falls in
________________ the ______________ trait and the
___________________ trait.
Example:
In flowers, petal color demonstrated incomplete dominance.
Red results when a flower has homozygous dominant alleles for
the trait. White results when a flower has homozygous
recessive alleles for the trait. A flower that is heterozygous for
this trait will be pink. Predict the genotypic and phenotypic
tatios of the offspring for the following:
1. Red and white _____ X _____
Codominance
__________________: condition in which ________ alleles of a
gene are _____________ in ________________ offspring.
Example 1:
In cows black coat color and white coat color are codominant.
Heterozygous offspring will be spotted.
1. Black cow and white cow _____ X _____
Genotypic Ratio:
Genotypic Ratio:
Phenotypic Ratio:
Phenotypic Ratio:
2. Black cow and spotted cow _____ X _____
Genotypic Ratio:
2. Red and pink _____ X _____
Phenotypic Ratio:
Genotypic Ratio:
3. Both spotted cows _____ X _____
Phenotypic Ratio:
Genotypic Ratio:
Phenotypic Ratio:
1
3
Example 2:
In blood typing, the gene for type A and the gene for type B are
codominant. The gene for type O is recessive.
3. White and pink _____ X _____
Genotypic Ratio:
Blood Type (Phenotype)
Genotype(s)
Phenotypic Ratio:
4. Pink and pink _____ X _____
Genotypic Ratio:
Determine the possible blood types of the offspring when:
1. Mother is type O, Father is type A (homozygous)
Phenotypic Ratio:
_____ X _____
Genotypic Ratio:
Phenotypic Ratio:
2. Mother is type AB, Father is Type A (heterozygous)
_____ X _____
Genotypic Ratio:
Phenotypic Ratio:
2
4
3. Mother is type A (heterozygous), Father is type B
(heterozygous)
_____ X _____
Genotypic Ratio:
Phenotypic Ratio:
4. Mother is type B (homozygous), Father is type A
(homozygous)
_____ X _____
Genotypic Ratio:
Phenotypic Ratio:
5