EVO 3.2 Rates of Speciation- Pre AP Biology Study Notes - New Syllabus.
EVO 3.2 Rates of Speciation- Pre AP Biology Study Notes
EVO 3.2 Rates of Speciation- Pre AP Biology Study Notes – New Syllabus.
LEARNING OBJECTIVE
EVO 3.2(a) Describe factors that affect the rate of speciation.
EVO 3.2(b) Use evidence to support the claim that rates of speciation have varied throughout Earth’s history.
EVO 3.2(c) Explain how environmental change can result in the extinction of a species.
Key Concepts:
EVO 3.2.1 Rates of speciation and extinction have fluctuated throughout Earth’s history in response to changing environmental conditions.
a. Gradualism is a model of evolution whereby lineages accumulate small genetic changes over time.
b. Punctuated equilibrium indicates that periods of stability for species can be punctuated with periods of rapid speciation, or splitting of lineages.
c. Extinction events that occur simultaneously across numerous species, within a relatively short period of geologic time, are known as mass extinctions.
d. There have also been human-induced extinctions due to overharvesting and/or changes in habitat (e.g., great auk, passenger pigeon).