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Biology for majors Week 4- Speciation

by: Tasha Nelson

Biology for majors Week 4- Speciation Bio 1130

Marketplace > East Tennessee State University > Biology > Bio 1130 > Biology for majors Week 4 Speciation
Tasha Nelson
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About this Document

These notes are condensed from class and the chapter in the book.
Biology for Science Majors 3
Jennifer Price
Class Notes
Biology, genetic, drift




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This 1 page Class Notes was uploaded by Tasha Nelson on Tuesday September 20, 2016. The Class Notes belongs to Bio 1130 at East Tennessee State University taught by Jennifer Price in Fall 2016. Since its upload, it has received 22 views. For similar materials see Biology for Science Majors 3 in Biology at East Tennessee State University.


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Date Created: 09/20/16
Chapter 22 The Origin of Species:   ­ Within a single species, individuals in populations that occur in different areas  may be distinct from one another. Such groups of distinctive individuals may be  classified as subspecies. ­ Populations whose members do not mate with each other or who cannot produce  fertile offspring are said to be reproductively isolated.  Prezygotic isolating mechanisms prevent the formation of a zygote  Ecological Isolation: Species that occur in the same area, but they don’t interact  with one another.   Behavioral Isolation: Species that differ in their mating rituals.  Temporal Isolation: Species reproduce in different seasons or at different times  of the day.   Mechanical Isolation: Structural differences between species that prevent  mating.  Prevention of Gamete Fusion: gametes with one species function poorly with  gametes of another or in the reproductive tract. ­ Postzygotic isolating mechanisms prevent normal development into reproducing  adults.  Natural selection and the ecological species concept  An alternative hypothesis proposes that the distinction among species are  maintained by natural selection. This is the idea that each species has adapted to its  own specific part of its environment.  The role of Genetic Drift and natural selection in speciation­  ­ Random changes may cause reproductive isolation ­ Adaptation can lead to speciation  Microevolutionn­ the short term  Macroevolution­ the long term process


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