Epistasis problems:

1. In a certain breed of plants, D produces dark red color and is dominant over d which produces a light red color.  Another gene determines in which cells the pigment will be synthesized.  Allele w allows synthesis of the pigment throughout the petals but the mutant allele W prevents pigment production. 

You cross two plants that are DdWw.

What key will you use to determine the different phenotypes? What will be the genotype and phenotype ratios of the crosses?

2.  In a certain breed of plants, W produces blue flowers and is dominant over w which produces green flowers.  Another gene determines in which cells the pigment will be synthesized.  Allele M allows complete synthesis of the pigment throughout the flowers but the mutant allele m prevents pigment production. 

You cross two plants that are WwMm.

What key will you use to determine the different phenotypes? What will be the genotype and phenotype ratios of the crosses?