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  4. Pure tall pea plant with round seeds is crossed with pure dwarf pea plant with wrinkled seeds. The probability of genotype ttRR in F2 generation is

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Q. Pure tall pea plant with round seeds is crossed with pure dwarf pea plant with wrinkled seeds. The probability of genotype ttRR in $F_{2}$ generation is

NTA AbhyasNTA Abhyas 2020Principles of Inheritance and Variation

Solution:

Mendelian dihybrid cross occurs between two pair of contrasting characters - height of plant and shape of seed. When these are crossed in the $F_{2}$ generation we get the following genotypes and their count:
$TTRR \, - \, 1, \, TTRr \, - \, 2, \, TTrr \, - \, 1, \, $
$TtRR \, - \, 2, \, TtRr \, - \, 4,$
$ \, Ttrr \, - \, 2, \, ttRR \, - \, 1, \, $
$ttRr \, -2 \, and \, ttrr \, - \, \, 1$