a process of producing two individual species from one
- members of the population that interbreed to produce fertile offspring
organism are divided by a geographical feature such as a lake or canyon
Organisms may appear to be alike and be different species. Organisms may look different and yet be the same species.
Change in chromosome number
Polyploid species result from nondisjunction (chromosomes fail to separate properly) during meiosis or mitosis.
only takes one generation
the idea that species evolve at a slow, steady rate, with small, adaptive changes gradually accumulating over time.
- argues that speciation occurs quickly, in rapid bursts, with long periods of genetic equilibrium in between.
when species that were once similar (become more and more different)
When one species evolves into an array of different species to fit environmental habitats
Occurs when unrelated species occupy similar environmental habitats in different areas of the world. Similar environmental pressures and similar natural selection pressures allows different species to look alike.