Catalyst – April 23, 2010 D = dimples, d = no dimples F = freckles, f = no freckles 1.Show the dihybrid cross for the following: Female - Heterozygous.

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Presentation transcript:

Catalyst – April 23, 2010 D = dimples, d = no dimples F = freckles, f = no freckles 1.Show the dihybrid cross for the following: Female - Heterozygous for both traits Male – Heterozygous for both traits 2.Give the phenotypic ratio for the cross in question 1

Incomplete Dominance The phenotype of the offspring is a mixture of the two phenotypes of the parents. Neither of the alleles is dominant to the other. This results in a new phenotype

Example: Skin Color

Codominance The phenotype of the offspring is a combination of the phenotypes of both parents. Both alleles are expressed separately and contribute to the offspring’s appearance

Example - Chickens A black-feathered (BB) chicken crossed with a white-feathered (WW) chicken results in a black and white feathered chicken (BW).

Show the Cross If a black chicken (BB) and a white chicken (WW) mate, what is that probability that the baby chicken will be black? White? Mixture? What happens if a black and white chicken (BW) mates with another black and white chicken? What is the phenotypic ratio?

Incomplete Dominance?

Codominance?

Incomplete Dominance?

Codominance?

Incomplete Dominance?

Practice Problems Codominance: B = Black, W = White Incomplete Dominance: R = Red, Y = Yellow Male genotype: BWRR Female genotype: BBYY Cross these, give the phenotypic ratio.