Reading And Concept Review Packet Page 4
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6Incomplete Dominance
Incomplete Dominance is a heterozygous condition in which both alleles are partially expressed, often
producing an intermediate phenotype.
1. In snapdragons, when a red flower (R) is crossed with a white flower (W), the offspring are pink (RW)
Perform a cross of pink flower with another pink flower.
Male P arent
Genotype
Ratio
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4
4
%
Phenotype
Ratio
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4
4
%
2. What would you expect from the mating of a gray rooster with a black hen assuming incomplete
dominance of black (B) over white (W)?
Male P arent
Genotype
Ratio
4
4
4
%
Phenotype
Ratio
4
4
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%
3. In some cats the gene for tail length shows incomplete dominance. Cats with long tails and cats with no
tails are homozygous for their respective alleles. Cats with one long tail allele and one no tail allele have
short tails. What would be the predicted offspring from a cross between a short tailed cat and a cat with
no tail?
Male P arent
Genotype
Ratio
4
4
4
%
Phenotype
Ratio
4
4
4
%
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