Answer and explanation

Correct answer: D. all the alleles of all the genes in a population

  1. Step 1: The gene pool contains every allele present in the interbreeding population.
Answer
all the alleles of all the genes in a population.
Why not the others: all the genes found in a single individual: this is the genome of one individual. the total number of individuals in a population: this is the population size. the set of species in an ecosystem: this describes biodiversity.

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