Q783
Test cross ratio in case of duplicate gene action will be
A.
2 : 1
B.
1 : 1 : 1 : 1
C.
4 : 1
D.
3 : 1
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
Test cross ratio in case of duplicate gene action will be 3 : 1.The test cross is another fundamental tool devised by Gregor Mendel. A test cross is an experimental cross of an individual organism with a dominant phenotype but an unknown genotype and an organism with a homozygous recessive genotype.
The phenomenon when either of the genes can provide the wild-type phenotype, this interaction is called duplicate gene action. Thus, the test cross in case of duplicate gene action will give a ratio of 3 : 1.