question_answer

When two hybrids rrTt and Rrtt are crossed, the phenotype ratio of offspring would be

A)  3 : 1                                      

B)  9 : 3 : 3 : 1

C)  1 : 1                      

D)         1 : 1 : 1 : 1

Correct Answer: D

Solution :

All the offsprings have different phenotypes. Therefore, the phenotypic ratio obtained by crossing rrTt and Rrtt is 1 : 1 : 1 : 1.