Question

Flower color in certain plants is governed by epistasis. P=purple, p=white, C=curved petals, c=strait petals. A homozygous recessive petal shape prevents purple color. If parent plants are Ppcc X PPCc, what are the genotypes and phenotypic ratios of the offspring?

Answer 1

Genotype PPCc – 4 (1/4)

Genotype PpCc – 4 (1/4)

Genotype PPcc – 4 (1/4)

Genotype Ppcc – 4 (1/4)

Phenotype of purple/curved – 50%

Phenotype of white/straight – 50%

Step-by-step explanation:

P=purple, p=white, C=curved petals, c=strait petals

Ppcc X PPCc

Gametes of Ppcc are Pc, Pc, pc, pc

Gametes of PPCc are PC, Pc, PC, Pc

Pc Pc pc pc

PC PPCc PPCc PpCc PpCc

pc Ppcc Ppcc ppcc ppcc

PC PPCc PPCc PpCc PpCc

pc Ppcc Ppcc ppcc ppcc

Genotype PPCc – 4 (1/4)

Genotype PpCc – 4 (1/4)

Genotype PPcc – 4 (1/4)

Genotype Ppcc – 4 (1/4)

Phenotype of purple/curved – 50%

Phenotype of white/straight – 50%