Animal: Man Trait: degree of skin pigmentation Background: Assume that there are two gene pairs that both help determine skin color (there are actually many gene pairs), and that they are incompletely dominant. If a person has the AABB Genotype they have a very dark brown skin; if AABb or AaBB , dark brown; if AaBb or AAbb or aaBB, medium brown ; if Aabb or aaBb, light brown; and if aabb , very pale. Problem: A person with the AABb genotype mates with an Aabb person. What are the possibilities of the children for this couple? Trait: degree of skin pigmentation Background: Assume that there are two gene pairs that both help determine skin color (there are actually many gene pairs), and that they are incompletely dominant. If a person has the AABB Genotype they have a very dark brown skin; if AABb or AaBB , dark brown; if AaBb or AAbb or aaBB, medium brown ; if Aabb or aaBb, light brown; and if aabb , very pale. Problem: A person with the AABb genotype mates with an Aabb person. What are the possibilities of the children for this couple? a. a complete key, including all genotypes and their phenotypes (even those that might not be needed in that particular cross) b. the cross itself (both parents genotypes) c. your calculations of the offspring possibilities (Punnett square, probability, etc.) d. genotype and phenotype ratios of those offspring e. answers to any special questions within each problem Genetics Ty.pe: Dihybrid, cumulative factors (blending), incomplete dominance Animal: man Trait: degree of skin pigmentation Background: Assume that there are two gene pairs that both help determine skin color (there are actually many gene pairs), and that they are incompletely dominant. If a person has the AA BB genotype they have very dark brown skin; if AA B b or A a BB , dark brown; if A a B b or AAbb or aa BB , medium brown; if A abb or aa B b , light brown; and if aabb , very pale. Problem: A person with the AA B b genotype mates with an A abb person. What are the possibilities for the children of this couple? .