Probability of genotype $T T r r$ in $F_{2}$ -generation of a dihybrid cross is _____________.

\frac{1}{16}

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\frac{3}{16}

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\frac{9}{16}

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\frac{6}{16}

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Solution

The correct option is A $\frac{1}{16}$
Parent generation TTRR $\times$ ttrr
Gametes TR tr
$F 1$ generation TtRr
selfing
Gametes $\to$ TR, Tr, tR, tr
TR Tr tR tr
TR TTRR TTRr TtRR TtRr
Tr TTRr TTrr TtRr Ttrr
tR TtRR TtRr ttRR ttRr
tr TtRr Ttrr ttRr ttrr
So, probability of TTrr in $F_{2}$ generation is $1 / 16$ .

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Probability of genotype TTrr in F2-generation of a dihybrid cross is _____________.

The correct option is A 116Parent generation TTRR × ttrrGametes TR trF1 generation TtRrselfingGametes→ TR, Tr, tR, tr TR Tr tR trTR TTRR TTRr TtRR TtRrTr TTRr TTrr TtRr TtrrtR TtRR TtRr ttRR ttRrtr TtRr Ttrr ttRr ttrrSo, probability of TTrr in F2 generation is 1/16.

Probability of genotype $T T r r$ in $F_{2}$ -generation of a dihybrid cross is _____________.