1. In corn the allele for purple (P) is dominant to the allele for yellow kernels (p). Predict the F1 genotype and phenotype ratio of a cross between two heterozygous purple kerneled plants.
2. In humans, albinism(a) is recessive to normal skin pigmentation(A). A man with normal skin pigmentation whose mother was an albino, marries an albino woman. Predict the phenotype ratio of their children.
3. In guinea pigs, black (B) is dominant to white (b). If a homozygous black is mated with a white guinea pig, predict the genotypic and phenotypic ratios for the F1 and F2 generations.
4. In snapdragons, neither the red allele or the white allele for flower color is dominant. The heterozygote is pink in color. (Use RR for red, Rr for pink and rr for white). Predict the genotype and phenotype ratios that result from this cross:
pink x pink

5. In peas, assume tall (T) is dominant to dwarf (t) and long pods (L) is dominant to short pods (l). If you cross a homozygous tall plant having short pods with a dwarf plant with short pods, predict the genotypic and phenotypic ratio of the F1.
6. In sea monsters, the allele for yellow eyes (Y) is dominant to the allele for green eyes(y) and the gene for fins on the back (F) is dominant to that for finless (f). If a completely heterozygous yellow eyed finned sea monster mates with a completely homozygous green eyed finless sea monster, predict the phenotype ratio of the F1.
7. The allele (gene) for hemophilia is recessive and sex-linked. A hemophiliac male marries a normal (non-hemophiliac) woman whose father was a hemophiliac. Predict what kind of children they would have and in what proportions (separate the sons from the daughters).
8. A woman with normal color vision has two children. One boy has normal vision and one girl is colorblind. The daughter’s colorblindness is a sex-linked recessive trait. Predict the genotypes of the mother, father and both children.
9. Is it possible for a child with blood type O to be produced by two AB parents? Explain your answer using a Punnett Square.
10. In a case of disputed paternity, the child is type O and the mother is type A. Could an individual of the following blood types be the father? Explain each possibility.
O

A

B

AB

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