Evolutionary Biology Concept Question

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Discussion Overview

The discussion centers on the persistence of variation in the natural world, particularly in the context of evolutionary biology. Participants explore various explanations for this phenomenon, considering factors such as genetic drift, directional selection, and other evolutionary mechanisms.

Discussion Character

  • Exploratory, Debate/contested, Homework-related, Conceptual clarification

Main Points Raised

  • Some participants propose the Red Queen Hypothesis as a reason for persistent variation, suggesting that changing fitness peaks drive continuous adaptation.
  • Others mention gene flow as a potential explanation for maintaining variation within populations.
  • One participant raises a question about how the proposed explanations specifically address the persistence of variation.
  • Another participant introduces the concept of symbiogenesis, highlighting the roles of opportunism and cooperation in evolutionary processes.
  • One suggestion involves researching polymorphism, with mentions of factors like lack of selection pressure, frequency-dependent selection, and heterozygous advantage as possible explanations for variation.

Areas of Agreement / Disagreement

Participants express differing views on the explanations for variation, with no consensus reached on which factors are most significant or correct.

Contextual Notes

Some explanations depend on specific definitions and assumptions about evolutionary mechanisms, and the discussion does not resolve the complexities of these concepts.

student93
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What are possible explanations as to why variation persists in the natural world despite the effects of genetic drift and directional selection?
 
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This looks like a homework assignment problem.

What explanations have you come up with so far?
 
jedishrfu said:
This looks like a homework assignment problem.

What explanations have you come up with so far?

One explanation I thought was because of the Red Queen Hypothesis -> Fitness Peak is always changing so organisms keep adapting and changing.

Another explanation was Gene Flow

Are either or both of these correct?
 
How do your answers address the variation persists part?
 
Look at symbiogenesis at the cell level … opportunistic and cooperative. Mutualism may be the norm, not the exception.
 
I suggest you research polymorphism. Basically, it could be gene flow, lack of selection pressure, frequency dependent selection (is good when it is the exception, is bad when it is the norm), or heterozygous advantage (if you have 1 copy of the gene it is good, 2 is bad, 0 is bad, such as Sickle-Cell Anemia).
 

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