1. In certain cattle, hair color can be red (homozygous RR), white (homozygous
R’R’), or roan (a mixture of red and white hairs, heterozygous RR’).
a. When a bull is mated to a white cow, what genotypes and phenotypes of
offspring could be obtained?
b. If one of the offspring in (a) were mated to a white cow, what genotypes
and phenotypes of offspring could be produced? In what proportion?
2. The palomino horse is golden in color. Unfortunately, for horse fanciers,
palominos don’t breed true. In a series of matings between palominos, the
following offspring were obtained:
65 palominos, 32 cream colored,
34 chestnut (reddish brown)
What is the probable mode of inheritance?
3. In the edible pea, tall (T) is dominant to short (t), and green pods (G) are
dominant to yellow pods (g). List the genotypes and phenotypes of the offspring
that would be produced in the following crosses:
a. TtGg x TtGg
b. TtGg x TTGG
c. TtGg x Ttgg
4. In tomatoes, round fruit (R) is dominant to long fruit (r), and smooth skin (S) is
dominant to fuzzy skin (s). A true breeding round, smooth tomato (RRSS) was
crossed bred with at true breeding long fuzzy tomato (rrss). Give the genotypes
and phenotypes of both the F1 and the F2 generations.
1. In certain cattle, hair color can be red (homozygous RR), white (homozygous
R’R’), or roan (a mixture of red and white hairs, heterozygous RR’).
a. When a bull is mated to a white cow, what genotypes and phenotypes of
offspring could be obtained?
b. If one of the offspring in (a) were mated to a white cow, what genotypes
and phenotypes of offspring could be produced? In what proportion?
2. The palomino horse is golden in color. Unfortunately, for horse fanciers,
palominos don’t breed true. In a series of matings between palominos, the
following offspring were obtained:
65 palominos, 32 cream colored,
34 chestnut (reddish brown)
What is the probable mode of inheritance?
3. In the edible pea, tall (T) is dominant to short (t), and green pods (G) are
dominant to yellow pods (g). List the genotypes and phenotypes of the offspring
that would be produced in the following crosses:
a. TtGg x TtGg
b. TtGg x TTGG
c. TtGg x Ttgg
4. In tomatoes, round fruit (R) is dominant to long fruit (r), and smooth skin (S) is
dominant to fuzzy skin (s). A true breeding round, smooth tomato (RRSS) was
crossed bred with at true breeding long fuzzy tomato (rrss). Give the genotypes
and phenotypes of both the F1 and the F2 generations.