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The presence of a ‘gene pool’ in a population implies that:

  1. The genes in the population are static over time

  2. Genes are shared between members of the population

  3. All individuals in the population exhibit the same gene

  4. All members of the population are related

The correct answer is: Genes are shared between members of the population

A gene pool is defined as the collection of all the genes and their different alleles within a population. This includes all the genetic variations that are shared between members of the same population. This also means that individuals in the population may have different combinations of these genes and alleles, which allows for genetic diversity and the potential for natural selection to occur. Therefore, options A, C, and D are incorrect because they do not accurately describe the concept of a gene pool and how genes are shared within a population.