↞ Non-Mendelian Genetics Open-Note Quiz Part 1: Incomplete Dominance In a certain type of chicken black feathers (b) and white feathers (w) exhibit incomplete dominance. The heterozygous (bw) chickens have blue-grey feathers. 1. Complete a Punnett square for a homozygous black chicken that mates with a heterozygous chicken. 2. What percentage of the offspring will have a heterozygous genotype? Part 2: Codominance In a certain fish, blue scales (B) and red scales (R) are codominant. When a fish has the hybrid genotype (BR), it has a patchwork of blue and red scales. 3. What happens if you breed a patchwork fish with a fish that only has blue scales? Complete a Punnett square. 4. What is the probability of having fish with red scales? ________% 5. What is the probability of having fish with patchwork scales? _________% Part 3: Multiple Alleles In blood typing, the gene for type A and the gene for type B are dominant. The gene for type O is recessive. 6. A mother is type O, and a father is type B heterozygous. Complete the Punnett square. 7. Determine the percentage of each blood type: _____________ % Type O _____________ % Type A _____________ % Type B _____________ % Type AB Part 4: Sex-Linked Trait Duchenne Muscular Dystrophy is an x-linked recessive trait. Affected individuals have rapid degeneration of their muscles, and usually only live into their 20s or 30s. 8. A woman who is a carrier of the disorder (but is not affected) has a child with a man who does not have the disorder. Create a Punnett square to show the genotype probabilities of their child. 9. What is the probability (in percent) of these two people having a boy who does not have the disorder?
