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  4. text1: 1: 1: 1 ratio of progenies can be obtained if the plants employed for crossing are (A.) textTTRR × ttRR (B.) textTtRr × ttrr (C.) textTtRR × ttrr (D.) textTtrr × ttRr

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Q. $\text{1 : 1 : 1 : 1}$ ratio of progenies can be obtained if the plants employed for crossing are
$\left(A.\right) \, $ $\text{TTRR \times ttRR}$
$\left(B.\right)$ $\text{TtRr \times ttrr}$
$\left(C.\right)$ $\text{TtRR \times ttrr}$
$\left(D.\right)$ $\text{Ttrr \times ttRr}$

NTA AbhyasNTA Abhyas 2022

Solution:

$\text{1:1:1:1}$ is a dihybrid test cross ratio. It is obtained when crossing is done between a hybrid and a recessive genotype, when two gene loci are considered simultaneously.