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(D) $1$. Let the tall trait be represented by $TT$ and the dwarf trait by $tt$.$2$. The cross between pure tall $(TT)$ and pure dwarf $(tt)$ produces

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$1:2:1 ::$ Tall homozygous : Tall heterozygous : Dwarf

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(D) $1$. Let the tall trait be represented by $TT$ and the dwarf trait by $tt$.$2$. The cross between pure tall $(TT)$ and pure dwarf $(tt)$ produces $F_1$ generation plants with the genotype $Tt$ (all tall).$3$. When $F_1$ plants $(Tt)$ are self-pollinated $(Tt 	imes Tt)$,the resulting $F_2$ generation genotypes are $TT$,$Tt$,$Tt$,and $tt$.$4$. The genotypic ratio is $1(TT) : 2(Tt) : 1(tt)$.$5$. Here,$TT$ is homozygous tall,$Tt$ is heterozygous tall,and $tt$ is homozygous dwarf.$6$. Therefore,the ratio is $1:2:1$ for Tall homozygous : Tall heterozygous : Dwarf.

$A$ pure tall garden pea plant is crossed with a pure dwarf garden pea plant. When the $F_1$ generation plants are self-pollinated,the resulting genotypic ratio is:

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