Which of the following is Top cross

A. (A × O.P variety) × B

B. Inbred × O.P var

C. (A x B) × O.P variety

D. (A × B) × (C × D)

Answer: Option B

Solution(By Examveda Team)

From the given options, Inbred × O.P var is the Top cross.
It refers to the use of highly inbred males to the females of the base population or non-inbred population.
The top cross is a cross between a superior or purebred male and inferior female stock to improve the average quality of the progeny.