Question

In a dihybrid test cross, the proportion of individuals showing recessive phenotypes would be

• A. 1/16
• B. 7/16
• C. 1/4
• D. 3/4

Answer 1

The correct option is C 1/4

A cross is made between F1 individual and homozygous recessive parent is called test cross. In dihybrid test cross,16 progeny are formed, in which 4 progeny shows double heterozygous yellow round seeds(YyRr, 25%) 4 progeny shows heterozygous yellow homozygous round seeds(25%) 4 progeny shows double homozygous green and round(yyRR, 25%) remaining 4 progeny shows double homozygous recessive green, wrinkled seeds(yyrr,25%). The ratio is 1:1:1:1.

So, the correct option is ‘1/4’.