a study published in 1976 included blood type data on 400 basques from spain, of which 230 were rh and 170 were rh-. calculate the allele frequencies of d (i.e., the allele which in homozyogous form results in the rh phenotype) and d (the allele which in homozyogous form results in the rh- phenotype; the phenotype of dd is rh ). how many of the rh individuals would be expected to be heterozygous?