1) A cross between two sweet pea plants produced 39 plants with pink flowers (incomplete dominance), 18 with white flowers, and 19 with red flowers. What are the phenotypes of the parents?
2) A normal-visioned man of blood group A marries a normal-visioned woman of blood group A. They have two children, a color-blind boy of blood group A and a normal-visioned girl of blood group O. What were the genotypes of the parents?
3) A narrow reduced eye, B, is the dominant X-linked condition in fruit flies. The full red eye is produced by its recessive allele, b. A homozygous wild-type female is mated to a reduced eye male. Determine the F1 and F2 genotypic and phenotypic ratios.
4) Twenty-five percent of the offspring of a certain pair of white sheep are black. If the white is dominant to black, what was the genotype of the parents?
5) In summer squash, white fruit color is dominant, W, and yellow fruit color is recessive, w. A dominant allele at another locus, S, produces disc-shaped fruit, and its recessive allele, s, produces sphere-shaped fruit. If a true-breeding white disc variety is crossed with a homozygous yellow sphere variety, the F1 are all white disc hybrids. If the F1 is allowed to mate at random, what would be the phenotypic ratio expected in the F2 generation?