Question

Choose the correct answers from the alternatives given.
Most of biological diversity has probably arisen by:

• A. anagenesis
• B. cladogenesis
• C. sympatric speciation
• D. phyletic evolution

Answer 1

The correct option is B cladogenesis

Anagenesis and cladogenesis are the two main ways speciation occurs. One involved the slow transition of one species to another. Cladogenesis involved the separation of a species into two or more groups, with each group then becoming its own separate species.

Phyletic gradualism is a model of evolution which theorizes that most speciation is slow, uniform and gradual. When evolution occurs in this mode, it is usually by the steady transformation of a whole species into a new one.

Sympatric speciation is a geographic mode of speciation due to geographical isolation new species is form.

So correct answer is B, cladogenesis.