Question: Suppose a phenotype is controlled by an additive genetic system with alleles contributing equally. In this system we observe a range in phenotypes from 20 to 100. If we self cross individuals that are heterozygous at all the genes involved, we observe that 6 out of 1500 offspring have phenotype 20. Given this, how many genes are likely to be involved in influencing the phenotype?A. 11 B. none of these answers are correct Correct C. 4 D. 3 E. 5