What does it mean for a species to share a common gene pool?

When a species is said to share a common gene pool, it refers to the ability of individuals within that species to interbreed and exchange genetic material. This interbreeding allows for the mixing of genes, leading to genetic diversity within the population. The concept of a gene pool encompasses all the alleles present in a population, and through reproduction, genes can be passed on, reshuffled, or introduced via mutations, thereby influencing the overall genetic makeup of that species.

The other options address aspects related to genetics and populations but do not accurately define the meaning of a common gene pool. Identical DNA sequences are not necessary within a species, as there is typically a variety of alleles. Sharing a geographical area pertains to distribution rather than genetic exchange, as two separate species can occupy the same space without interbreeding. Additionally, while genetic diversity is an outcome of sharing a common gene pool, it does not describe the pooling itself. Therefore, the defining characteristic of a common gene pool is indeed the capacity for interbreeding and the exchange of genetic material among individuals of the species.