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(A) Let the gene for tallness be represented by $T$ (dominant) and the gene for dwarfness be represented by $t$ (recessive).$1$. The genotype of a het

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$50$

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(A) Let the gene for tallness be represented by $T$ (dominant) and the gene for dwarfness be represented by $t$ (recessive).$1$. The genotype of a heterozygous tall plant is $Tt$.$2$. The genotype of a dwarf plant is $tt$.$3$. The cross is $Tt 	imes tt$.$4$. The gametes produced by $Tt$ are $T$ and $t$,while the gametes produced by $tt$ are $t$ and $t$.$5$. Punnett square analysis:- $T 	imes t = Tt$ (Tall)- $T 	imes t = Tt$ (Tall)- $t 	imes t = tt$ (Dwarf)- $t 	imes t = tt$ (Dwarf)$6$. The offspring ratio is $2$ Tall $(Tt)$ : $2$ Dwarf $(tt)$,which simplifies to $1:1$.$7$. Therefore,the proportion of dwarf plants is $2/4 = 50\%$.

$A$ heterozygous tall plant is crossed with a dwarf plant. The proportion of dwarf plants in the offspring will be: (in $\%$)

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