Three pairs of genes with two alleles each (A1 and A2 , B1 and B2 , and C1 and C2 ) control the height of a plant. Suppose that the 1 allele is dominant in each case and the 2 allele is recessive. Under this revised scheme, the dominant phenotype contributes 12 cm to expected height and the recessive phenotype contributes 6 cm.

Part A) What is the expected height of a plant that is homozygous for 1 alleles?
Part B) What is the expected height of a plant that is homozygous for 2 alleles?
Part C) What is the height of the F1 progeny of these homozygous plants?