If two species are able to mate and produce an offspring which can mate with itself,but which is unable to mate with its parent's species then this can best be described as an example of

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This is an example of sympatric speciation via polyploidy, where the offspring has a different number of chromosomes compared to its parent species and is therefore unable to mate with them, but can mate with individuals of the same polyploid form. Allopatric speciation occurs when populations are geographically separated, and disruptive selection and character displacement refer to changes in the traits of a population over time due to selective pressures. A species cluster is not a recognized term in evolutionary biology.

If Two Species Are Able to Mate and Produce an Offspring