Biology for majors Week 4- Speciation
Biology for majors Week 4- Speciation Bio 1130
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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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