Question

a population gene pool the combined alleles of all individuals in a population is called the populations phenotype mutation rate gene pool allele frequency

Explanation:

The question defines the combined alleles of all individuals in a population, which is the standard definition of a gene pool. Genotype refers to an individual's genetic makeup, mutation rate is the frequency of mutations, and allele frequency is the proportion of a specific allele in a population—none match the given definition except gene pool.

Answer:

gene pool