You cross a wheat plant with purple kernels that is homozygous
for both AA and BB (i.e. it is AABB) with a plant with white
kernels (aabb). You know that kernel color is a continuous
character, where each A or B allele contributes 1 unit of color,
giving the following phenotypes: 4 units: purple 3 units: dark red
2 units: red 1 unit: light red 0 units: white (a) What is the
expected frequency distribution of colors among the F1? (b) What is
the expected frequency distribution of colors among the F2?

Show work please. I need to be able to understand for my exam.
Thank you.