1. What are the possible genotypes and phenotypes of the offspring of a pea plant with yellow seeds (heterozygous) and a pea plant with green seeds? Give the probabilities for each possibility. [3 points]
2. What are the possible phenotypes of the offspring of a short pea plant with axial flowers (heterozygous) and a tall pea plant (heterozygous) with terminal flowers? If 100 pea plants are produced, how many would have each of the possible phenotypes? [2 points]
3. Pigment in mouse fur is only produced when the C allele is present. Individuals of the cc genotype are white. If color is present, it may be determined by the A, a alleles. AA or Aa results in agouti color, while aa results in black coats. What F1 and F2 phenotypic ratios are obtained from a cross between AACC and aacc mice? What phenomenon is demonstrated in this problem? [4 points]
4. The ruffed chicken has an under-chin wattle. A smooth wattle (S) is dominant over a wrinkled wattle (s). A red wattle (HR) is incompletely dominant with a white wattle (HW) so that an individual with HRHW will have a pink wattle. A chicken with a wrinkled red wattle is mated to a homozygous chicken with a smooth white wattle. What is the genotype and phenotype of the chicks? [4 points]