The individual genotypes in a breeding population, taken as a whole, are the

The individual genotypes in a breeding population, taken as a whole, are the gene pool.

A gene pool can be described as a collection of different genes(includes both genes expressed, and not expressed) within an interbreeding population. Definition of the gene pool can also be: the sum of all the alleles at all of the loci within the genes of a population of a single species.  

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