Dihybrid Crosses Practice
In tomatoes, tall vines (T) are dominant to dwarf vines (t), and red fruit (R) is dominant to yellow fruit (r).
A farmer mates a homozygous tall, red tomato plant (TTRR) with a heterozygous tall, red tomato plant (TtRr).
What is the percent chance that the offspring will be dwarf plants with yellow fruit?
A.25% B.50% C.75% D.100% E.0%
0%
Two insects heterozygous for both genes (W(Normal wing size)，w(Small wing size) ; (B(black body),b(yellow body)) are mated. What fraction of offspring are expected to have normal wing size and a yellow body?
A.3/16 B.1/16 C.1/4 D.3/4 E.9/16
A.3/16
If two organisms with genotype GgHh are crossed, what percent of offspring are expected to be homozygous recessive for both genes?
1/16
In a fish, gold skin color (G) is dominant to black skin color (g) and split tail fin (S) is dominant to single tail fin (s). A breeder crosses a male fish having GgSs genotype with a female fish having ggSs genotype. Determine the expected phenotypic ratio of the progeny.
A.3:1
B.9:7
C.3:1:3:1
D.9:3:3:1
C.3:1:3:1