15. In tomatoes, there are two alleles that affect stem color, one purple (P) and one green (p). The following crosses are performed with these results
parental phenotype offspring phenotypes
1. purple x green 422 purple, 417 green
2. purple x purple 426 purple, 135 green
3. purple x green 953 purple, 0 green
4. purple x green 404 purple, 387 green
What is the phenotype of the purple parent in cross number 4?