- A fruit fly with a genotype MmOo is mated with an identical fly. Use a dihybrid cross to show the genotype possibilities of their offspring.
- In guinea pigs, black fur (B) is dominant over white (b), and rough coat (R) is dominant over smooth (r). If a fully heterozygous black rough guinea pig is mated to a black rough animal that is also fully heterozygous, what is the chance that they will produce a white, smooth-coated guinea pig?
- Tall tomato plants are produced by the action of a dominant allele (T) and dwarf plants by its recessive allele (t). Hairy stems are produced by a dominant gene (H) and hairless stems by its recessive allele (h). A fully hetrozygous, tall, hairy plant is crossed with a dwarf hairless tomato plant. Determine the phenotypic ratio for the F1 generation.
- Black coat color in Cocker Spaniels is dominant, while red coat color is recessive; solid pattern is dominant, while spotted pattern is recessive. A solid black male is mated to a solid red female and produces a litter of six pups: two solid black, two solid red, one black and white, and one red and white. Determine the genotypes of the parents.
- In tomatoes, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). A plant that is RrTT is crossed with a plant that is rrTt. What are the chances of an offspring being heterozygous for both traits?