A) The equation is useful for the analysis of multifactorial traits. B) It is a test that can tell the difference between carriers of mutant alleles and those who do not have the allele at all. C) The Hardy-Weinberg can be used to calculate how many identical twins there are in a population. D) The Hardy-Weinberg equation can be used to estimate the carrier frequencies in populations. E) It gives a clue to the function of a gene.