Which term describes the process by which new species arise?

Which term describes the process by which new species arise?

• A. Cladistics
• B. Biological species concept
• C. Speciation
• D. Cladogram

Answer: (C)

Speciation is the evolutionary process that generates new species as populations accumulate genetic differences and become reproductively isolated, preventing gene flow between them. This divergence can happen through geographic separation (allopatric speciation), ecological or behavioral differentiation within the same region (sympatric or parapatric speciation), or chromosome changes (such as polyploidy in plants), among other pathways. Once reproductive isolation is in place, the populations no longer exchange genes, allowing them to evolve independently and become distinct species over time. Cladistics, by contrast, is a method for inferring evolutionary relationships based on shared derived traits. The biological species concept defines what a species is—groups that can interbreed and produce fertile offspring—but it is a way to delimit species rather than describe how new species form. A cladogram is simply a diagram that shows hypothesized relationships among groups, not the process that creates new species.

Speciation is the evolutionary process that generates new species as populations accumulate genetic differences and become reproductively isolated, preventing gene flow between them. This divergence can happen through geographic separation (allopatric speciation), ecological or behavioral differentiation within the same region (sympatric or parapatric speciation), or chromosome changes (such as polyploidy in plants), among other pathways. Once reproductive isolation is in place, the populations no longer exchange genes, allowing them to evolve independently and become distinct species over time.

Cladistics, by contrast, is a method for inferring evolutionary relationships based on shared derived traits. The biological species concept defines what a species is—groups that can interbreed and produce fertile offspring—but it is a way to delimit species rather than describe how new species form. A cladogram is simply a diagram that shows hypothesized relationships among groups, not the process that creates new species.