One true-breeding strain of the silkworm (Bombyx mori) lays
white eggs, and another true-breeding strain lays pink eggs. You
cross the pink and white pure breeding strains. The F1 progeny
(heterozygous) are white. After crossing two F1 progeny you obtain
the F2 progeny that are 12/16 white, 3/16 black and 1/16 pink
eggs.

a. What genetic phenomena best describes the inheritance of egg
color?

b. Using letters of your own choosing, write out the genotypes
that correspond to all of the individuals from the cross. You can
use an underscore to represent multiple genotypes if applicable
(ex. A_ = AA or Aa).

c. A black egg laying individual (with a pink parent) is mated
with the F1 progeny. What are the phenotypes and phenotypic
proportions of the progeny from the cross?