Bermark
Incomplete Dominance and Codominance Practice Problems
1. A cross between
a blue blahblah bird (B) and
a white blahblah (b) bird produces offspring
that are silver (Bb).
a. Is this an
à example o
of
incomplete dominance or codominance?
b. What are the genotypes of the parent blahblah birds in the original cross?
c. What is/are the
genotype(s) of the silver offspring?
d. What would be the phenotypes and ratios of offspring produced by two silver blahblah birds
mating?
Punnett square;
orange
fruits are crossed the following phenotypic ratios are present in the offspring: 25% red fruit,
2. The color of fruit
for plant "X" is determined by two alleles. When two plants with
50% orange fruit, 25% yellow fruit. Use the letter R to represent the genotypes.
a. What are the genotypes of the parent orange-fruited plants?
Punnett square:
3. A cross between a black (B) cat & a tan (b) cat produces a tabby patte (black & tan fur)
a. What pattern of inheritance does this illustrate
?
b. What percent of kittens would have tan fur if a tabby cat is crossed with a black cat?
Punnett square:
tr
4. In horses, chestnut and white coat colors are codominant. Heterozygous horses show both
colors. Show a cross between a heterozygous horse and a white horse.
a. Indicate genotype and phenotype ratios of the offspring.
Punnett square: