\begin{tabular}{l} T. A plant which is short is \\ 7. A \\ crossed with a plant that is \\ homozygous dominant for \\ height. What percentage of \\ plants will be short? \\ \hline\end{tabular}

To solve this problem, we need to understand the genetics involved in plant height. 1. **Identify the known conditions:** - We have two types of plants: one that is short (let's denote this as "s") and one that is homozygous dominant for height (let's denote this as "S"). - The homozygous dominant plant has the genotype "SS". 2. **Determine the genotype of the short plant:** - Since the short plant is recessive, its genotype must be "ss". 3. **Set up the cross:** - We are crossing a short plant (ss) with a homozygous dominant plant (SS). 4. **Use a Punnett square to determine the offspring:** - The possible gametes from the short plant (ss) are "s" and "s". - The possible gametes from the homozygous dominant plant (SS) are "S" and "S". 5. **Fill in the Punnett square:** \[ \begin{array}{c|c|c} & S & S \\ \hline s & Ss & Ss \\ \hline s & Ss & Ss \\ \end{array} \] 6. **Analyze the results:** - All offspring (100%) will have the genotype "Ss", which means they will all be tall since "S" is dominant over "s". 7. **Conclusion:** - Therefore, the percentage of plants that will be short is 0%. In summary, when a short plant (ss) is crossed with a homozygous dominant plant (SS), 0% of the offspring will be short.