Question

When a pea plant heterozygous for violet flower colour is self crossed, then 450 offsprings having violet flower colour are obtained.
Option :-
A) 300
B) 225
C) 113
D) 200​

Answer 1

Explanation:

Test cross is the cross which is done to find out the genotype of parents. Suppose the genotype of a pea plant parent with violet flowers is CC and that of homozygous recessive parent is cc. If the hybrid had yielded 50% violet flowers and 50% white flowers it is a clear case of heterozygous parents which means that the genotypes of parents are Cc and cc.

Genotype Cc (Violet flowers) X cc (white flowers)

Gametes C and c c and c

Punnette square

Gametes C c

c Cc cc

c Cc cc

Thus, 50% offsprings are with violet flowers and 50% with white flowers.