1. The problem asks for the expected outcome of crossing two tomato plants heterozygous for hairy stems, where hairy stems (H) are dominant and hairless stems (h) are recessive. 2. The genotype of each heterozygous plant is $Hh$. 3. The possible gametes from each parent are $H$ and $h$. 4. Using a Punnett square, we cross $Hh \times Hh$: $$\begin{array}{c|cc} & H & h \\ \hline H & HH & Hh \\ h & Hh & hh \\ \end{array}$$ 5. The genotypic ratio is: - $HH$: 1 - $Hh$: 2 - $hh$: 1 6. The phenotypic ratio (hairy vs hairless) is: - Hairy (dominant): $HH$ and $Hh$ = 3 - Hairless (recessive): $hh$ = 1 7. Therefore, the expected outcome is 75% hairy stems and 25% hairless stems. Final answer: 75% hairy stems; 25% hairless stems.