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Isolation mechanism

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in evolution, isolation mechanism is a mechanism that prevents two populations from interbreeding and thus enables the populations to diverge enough to allow separate species to evolve. Isolating mechanisms may also prevent interbreeding between overlapping species.

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  • February 18, 2024
  • 29
  • 2023/2024
  • Class notes
  • Nyongesa
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LECTURE 5: Isolation mechanisms



DR. BENSON O. NYONGESA




02/18/2024

, Isolation mechanism
Definition:
• Factors that prevent gene exchange

• Agents that hinder interbreeding of the group of individuals

• Isolating mechanisms are particularly important in the biolo
species concept, in which species of sexual organisms are d
by reproductive isolation, i.e. a lack of gene mixture.

• Types: a) Geographical and b) Reproductive isolating
mechanisms
02/18/2024

, Geographic Isolating mechanisms
• Occurs when populations cannot mate due to the existence o
physical barriers among them.

• Geographically separated populations aren’t necessarily disti
species

• Leads to the formation of allopatric species: Physical barrier
mountain, lake, fault line formation etc.




02/18/2024

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