Question

In a dihybrid cross involving RRTT x rrtt. What will be the ratio of red and tall plants in $F$_ generation.

• A. 3 : 1
• B. 1 : 1
• C. 1 : 2
• D. 2 : 3

Answer 1

Answer: (B)

1 : 1

In a dihybrid cross, R is a dominant allele that codes for red-colored flowers and T is a dominant allele that codes for the tallness of the plant.

RRTT $\times$ rrtt

$F_1$ generation RrTt

RT Rt rT rt

RT RRTT RRTt RrTT RrTt

Rt RRTt RRtt RrTt Rrtt

rT RrTT RrTt rrTT rrTt

rt RrTt Rrtt rrTt rrtt

In all pogenies, $12$ Red & $12$ Tall

$12$ Red $=12$ Tall

$1:1$

Option (B) is correct here.