Date _______ Dihybrid Crosses Name ____________________ 1. In the diagram above, label the gametes and the homologous chromosomes. 2. What process is being shown above? ________________________________ 3. What is the difference shown between diagram 1 and diagram 2? ___________________ _____________________________________________________________________ _____________________________________________________________________ 4. How many alleles are in the diploid cells? ______________________________________________ 5. How many alleles are in the gametes? ________________________________________________ 6. In your own words, explain what is meant by independent assortment? _____________________________________________________________________ _____________________________________________________________________ 7. In cats, red hair (R) is dominant to white hair (r) and yellow eyes (Y) are dominant to green eyes (y). A cat with homozygous red hair and has green eyes is crossed with a cat who is heterozygous for red hair and heterozygous for yellow eyes. Genotype Ratio: _____________ _____________ _____________ _____________ Date _______ Dihybrid Crosses Name ____________________ 8. In poodles, black is due to a dominant factor (B), and white to its recessive allele (b). Droopy ears is a dominant factor (D) and pointed ears are recessive (d). A white male with droopy ears was mated to a black female with pointed ears. They have 4 pups as follows: one black with droopy ears, one white with droopy ears, one black with pointed ears and one white with pointed ears. a) What is the genotype of the parents? Gametes Give the genotype of the puppies: Black, droopy ears _____________ White, droopy ears _____________ Black, pointed ears _____________ White, pointed ears _____________ _ 9. In cows, black is due to a dominant factor (B) and red to its recessive allele (b). Tail hair is due to a dominant factor (T) and hairlessness to its recessive allele (t). If a homozygous black hairless is mated to a homozygous red hairy, what will be the appearance of the F1 generation? a) What is the genotype of the parents? _____________________________________________ Gametes b) What is the phenotype ratio of the F1 generation?