**Category:** Genetics  
**Subtype:** Hardy-Weinberg Equilibrium  
**Problem Description:** This problem involves calculating the total frequency of the homozygous genotypes (AA and aa) in a population that is in genetic equilibrium, given the allele frequencies of A and a.  

**Summary:** Given the allele frequencies of A (0.3) and a (0.7), determine the combined frequency of the genotypes AA and aa in the population.