1. **Stating the problem:** We have a plant with genotype $PpTt$ where $P$ (purple flowers) is completely dominant over $p$ (white flowers), and $T$ (tall) is completely dominant over $t$ (dwarf). We need to determine the plant's appearance (phenotype). 2. **Understanding dominance:** Complete dominance means the dominant allele's trait will be expressed if at least one dominant allele is present. 3. **Analyzing flower color:** The genotype for flowers is $Pp$. - Since $P$ is dominant over $p$, the presence of one $P$ allele means the flowers will be purple. 4. **Analyzing plant height:** The genotype for height is $Tt$. - Since $T$ is dominant over $t$, the presence of one $T$ allele means the plant will be tall. 5. **Combining traits:** The plant will have purple flowers and be tall. 6. **Matching with options:** The correct description is option 5: purple flowers, tall. **Final answer:** The plant with genotype $PpTt$ will have purple flowers and be tall.