Lecture 3 Bio325 Fall 07

Lecture 3 Bio325 Fall 07 - 1 More complex relationships...

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Unformatted text preview: 1 More complex relationships between genotype and phenotype... Incomplete dominance : heterozygote has a phenotype intermediate between the homozygotes Fig. 3.3 codominance : heterozygote has both of the homozygote phenotypes Fig. 3.4 phenotype ratios in F2 complete dominant: incomplete dominant or codominant: 3:1 1:2:1 Fig. 3.4 2 Fig. 3.2 phenotype ratios in F2 complete dominant: incomplete dominant or codominant: 3:1 1:2:1 multiple alleles : more than 2 alleles possible per locus Fig. 3.5 3 Couple# 1 2 3 blood groups: A and A A and B B and O blood types of babies: B, O, AB Which couples match with which babies? Couple# 4 5 6 blood groups: A and AB A and O AB and O blood types of babies: A, B, AB genotypes? A rooster with gray feathers is mated with a hen of the same phenotype. Among their offspring, 15 chicks are gray, 6 are black, and 8 are white. What is the most likely explanation? a. multiple alleles b. multiple genes c. epistasis d. co-dominance e. incomplete dominance What does the ratio of phenotypes among the offspring (15:6:8) tell you? 4...
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This note was uploaded on 06/19/2008 for the course BIO 325 taught by Professor Saxena during the Fall '08 term at University of Texas at Austin.

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Lecture 3 Bio325 Fall 07 - 1 More complex relationships...

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