In a certain plant, trait A (stem length) is controlled by two alleles which interact by complete dominance. Trait B (seed color) is controlled by two alleles; brown color recessive to black color; however, the allelethat produces black color is a homozygous lethal allele. TraitD (leaf coloration) is controlled by two alleles with variegated phenotype being recessive to plain coloration. Based on this information:
A. Describe the phenotype of a plantheterozygous for all these genes
B. Predict the proportion of offspringthat that will be Tall with black seeds and variegated leaves iftwo heterozygous plants are mated
C. Predict the proportion of offspringthat will be homozygous for all three genes if two heterozygousplants are mated.