Question
Biology Question on Principles of Inheritance and Variation
Which of the following is a test cross?
A
Tt ? tt
B
T ? tt
C
Tt ? Tt
D
tt ? tt
Answer
Tt ? tt
Explanation
Solution
Test cross, is a cross in which a individual is crossed with recessive parent. The ratio will be 50% dominant and 50% recessive in case of hybrid individual. Test cross is used to determine whether an individual of dominant phenotype is homozygous or heterozygous, or to determine the degree of linkage.