Question 1

This problem appears to be an example of incomplete dominance.

First define alleles:

I^y = yellow allele

I^w = white alllele

----------------------------------------------------------------

Genotypes and their respective phenotypes:

I^y I^y (homozygous yellow alleles) = yellow

I^w I^w (homozygous white alleles) = white

I^y I^w (heterozygous) = cream

----------------------------------------------------------------

Parental (P) Cross

Yellow x White

I^y I^y x I^w I^w

----------------------------------------------------------------

F₁ Generation

All (100%) Cream: I^y I^w (100% heterozygous)

----------------------------------------------------------------

F₂ Generation

Punnett Square Illustrating F₁ Generation Cross:

F₂ Generation Genotype/Phenotype Ratio:

I^y I^y : I^y I^w : I^w I^w

yellow : cream : white

1 : 2 : 1