Question
Biology Question on evolution and natural selection
The ratio in a dihybrid test cross between two individuals is given by
A
2:01
B
0.04306713
C
3:01
D
1:1:1:1
Answer
1:1:1:1
Explanation
Solution
Test cross is a cross to know the genotype of the individual. The individual is crossed with recessive parent. The dihybrid test cross ratio is 1:1:1:1. The characters under consideration are tall white and dwarf black. Gametes of TtWw = TW, Tw, tW, tw Gametes of ttww = tw Thus the ratio of TtWw : Ttww : ttWw : ttww is 1 : 1 : 1 : 1.