1. In silkworms, a PURPLE cocoon is dominant over a BLUE cocoon. Cross a homozygous purple silkworm with a homozygous blue. List genotypes and phenotypes. 2. In guinea pigs, short fur is dominant over long fur. Cross a heterozygous female with a homozygous long furry male. List genotypes and phenotypes.

3.In race horses, black coat (B) and trotting gait (T) are dominant traits. Recessive traits are chestnut coat (b) and pacing gait (t). Use a Punnett square to determine the possible offspring from a cross between a heterozygous black coat trotter and one that is homozygous for black coat and is a pacer. List genotype and phenotype ratios.

4.In pea plants, a YELLOW (Y) color is dominant over PURPLE (y) and SMOOTH (S) is dominant over WRINKLED (s). Use a Punnett square to determine the F2 generation from a cross between a homozygous yellow smooth pea and a heterozygous yellow smooth pea. List the genotype and phenotype ratios.