Final answer:
The term in the algebraic form of the Hardy-Weinberg equilibrium for the heterozygote genotype frequency is 2pq.
Step-by-step explanation:
The term in the algebraic form of the Hardy-Weinberg equilibrium for the heterozygote genotype frequency is 3) 2pq.
The Hardy-Weinberg equation, p² + 2pq + q² = 1, represents allele and genotype frequencies in a population. In this equation, p represents the frequency of allele A, q represents the frequency of allele B, and 2pq represents the frequency of heterozygotes (Aa).
For the given gene with alleles A and B, the frequency of allele A is p and the frequency of allele B is q. The term 2pq represents the frequency of heterozygotes (Aa) in the population. Therefore, the correct answer is 3) 2pq.