Answer :
To assess speciation, the biological species concept cannot be applied to fossils.
A species, based on the biological species concept, is a group of organisms that can effectively interbreed and produce fertile offspring. This theory holds that both interbreeding within a species and reproductive barriers between organisms of different species help to protect a species' integrity. Most evolutionary biologists agree with the concept.
This same biological species concept is not applicable to fossil species so because flow of genetic data as well as reproductive behaviour cannot be studied using fossil remains. It is limited to living things that exhibit the interbreeding pattern. The phylogenetic species idea can be used to investigate fossil species.
Asexual reproduction does not involve interbreeding, and any evolution observed in organisms is the result of mutations. As a result, the concept of biological species does not apply to asexual organisms.
Allopatric speciation describes biological populations which are geographically separated and thus unable to interbreed. The concept of biological species is irrelevant to allopatric speciation.
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