Download REVIEW PROBLEMS

REVIEW PROBLEMS
1. In rabbits the allele for black coat color (B) is dominant over the allele for brown
coat color (b). What would be the results of a cross between an animal
homozygous for black coat color and one with brown coat color?
genotype ratio: ________________________________
phenotype ratio: ________________________________
2. A gardener has a tall pea plant. How can the gardener determine whether the plant is
homozygous dominant or heterozygous for the gene determining tallness? Show two
possible crosses that would reveal the genotype of the plant. Let T = dominant allele.
What is this cross called?
_______________ _______________
genotype ratio:
genotype ratio:
____________
___________
3. In northeast Kansas there is a creature know as a wildcat. It comes in
three colors: blue, red, and purple. A homozygous (BB) individual is
blue, a homozygous (bb) individual is red, and a heterozygous (Bb)
individual is purple. What would be the potential offspring if a blue
wildcat were crossed with a purple one?
genotype ratio: ________________________________
phenotype ratio:
________________________________
What concept is exhibited by this cross? __________________ __________________
4. In a certain cactus, prickly spines can be one pronged (OO) or two
pronged (TT). Heterozygous cacti grow a mixture of both spines.
Suppose hummingbirds successfully cross-pollinated a one pronged
cactus and a heterozygous cactus. What types of cacti would result?
genotype ratio: ________________________________
phenotype ratio:
________________________________
What concept is illustrated by the mixed-prong cacti? ____________________________
5. A father is heterozygous for type A blood. His wife has type AB blood. What
blood types will their children likely have? Complete the Punnett square.
genotype ratio: ________________________________
phenotype ratio:
________________________________
What concept is exhibited by this cross? __________________ __________________
6. What would be the results of a cross between two pea plants that were heterozygous for both
tall plants and smooth seeds? Let T = tall and N = smooth.
parental genotypes: _______________ x _______________
offspring genotype ratio:
______________________________________________
______________________________________________
offspring phenotype ratio:
______________________________________________
______________________________________________