Micro and macro evolution pdf
Microevolution vs macroevolution
Macroevolution refers most of the time, in practice to evolutionary patterns and processes above the species level. It is usually contrasted with microevolution, or evolutionary change within populations. Some evolutionary processes, such as the spread of a trait from one population to another, might count as within-species processes but not within-population processes. Population genetics see entry , which emerged during the modern synthesis of the early- to mid-twentieth century, explains within-population microevolutionary change in terms of natural selection , genetic drift , mutation, and migration. One question that looms over philosophical work on macroevolutionary theory is how macroevolution and microevolution are related. One view, which is closely associated with the modern synthesis, is that macroevolutionary patterns are fully explicable in terms of microevolutionary processes.
Note: Chapter 16 and 18 material has been condensed and combined here! Starr text: Ch 16 cover page, Background II. Evolution and Natural Selection IV. Scientific evidence for Evolution V. Natural Selection in Action VI.
Macroevolution is evolution on a scale at or above the level of species , in contrast with microevolution ,  which refers to smaller evolutionary changes of allele frequencies within a species or population. The process of speciation may fall within the purview of either, depending on the forces thought to drive it.
how to add books to kindle fire hd from computer