a. In a population at Hardy-Weinberg equilibrium, for a gene with two contrasting alleles (“A” and “a”), if the frequency of “A” is 0.8, the frequency of heterozygotes (“Aa”) in the next generation will be? (Please show your calculation)

b. In a population of plants at Hardy-Weinberg equilibrium, the proportion of plants with red flowers, which is the dominant flower color, is 0.64. All other plants have white flowers. What proportion of the total population of plants is heterozygous for flower color?