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(B) In a monohybrid cross,Mendel crossed two pure-breeding plants (e.g.,tall $TT$ and dwarf $tt$) to obtain the $F_1$ generation,which consisted of al

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$1:2:1$

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(B) In a monohybrid cross,Mendel crossed two pure-breeding plants (e.g.,tall $TT$ and dwarf $tt$) to obtain the $F_1$ generation,which consisted of all heterozygous tall plants $(Tt)$.When these $F_1$ plants were self-pollinated,the $F_2$ generation was produced.The gametes produced by $F_1$ $(Tt)$ are $T$ and $t$.Using a Punnett square,the resulting genotypes are $TT$,$Tt$,$Tt$,and $tt$.Thus,the genotypic ratio is $1$ $(TT)$ : $2$ $(Tt)$ : $1$ $(tt)$,which is $1:2:1$.

In a monohybrid cross experiment,the genotypic ratio of the progeny in the $F_2$ generation is ....

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