The probability of the genotype TTrr in the F | vedclass

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(A) In a dihybrid cross involving two traits (e.g.,height $T/t$ and seed shape $R/r$),the $F_1$ generation is heterozygous $(TtRr)$.When $F_1$ individ

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$\frac{1}{16}$

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(A) In a dihybrid cross involving two traits (e.g.,height $T/t$ and seed shape $R/r$),the $F_1$ generation is heterozygous $(TtRr)$.When $F_1$ individuals are self-crossed $(TtRr 	imes TtRr)$,they produce four types of gametes: $TR, Tr, tR, tr$.Using a Punnett square to analyze the $F_2$ generation,we get a total of $16$ combinations.The genotype $TTrr$ appears only once in the $16$ squares of the Punnett square.Therefore,the probability of the $TTrr$ genotype is $\frac{1}{16}$.

The probability of the genotype $TTrr$ in the $F_2$ generation of a dihybrid cross is:

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