Assume that plant height is determined by a pair of alleles at each of two loci (A and a, B and b) that are additive in their effects.  Further assume that each allele represented by an uppercase letter contributes 6 feet to height and that each allele represented by a lowercase letter contributes 2 foot to height.  If a plant with genotype Aabb is crossed to a plant with genotype aaBb, what heights are expected in the progeny? 1/216ft : 1/2 12ft 1/4 16ft : 1/2 12ft : 1/4 8ft 1/4 20ft : 1/2 16ft : 1/4 12ft 1/4 24ft : 1/2 20ft : 1/4 16ft 1/2 20ft : 1/2 16ft