2. In humans, a variant of hemoglobin causes severe sickle cell disease in homozygous form and mild anemia in heterozygous form with the common allele. A hospital in Phoenix recorded the following data in one month: Phenotype No anemia N of ER visits 810 180 10. Mild anemia Sickle cell disease a. What are the genotype and allele frequencies for this population? b. Is this population in Hardy-Weinberg proportions?