Traits had simple and discrete phenotypes with no in-between state. Traits were controlled by alternative alleles at one gene. Traits exhibited dominant and recessive inheritance patterns.
What about discrete phenotypes?
- Individual phenotypic variations often involve threshold expression of traits with polygenic inheritance.
- How such discrete pluralism evolves does not evolve from continuously changing phenotypes.
- It gets little theoretical attention.
- To identify conditions for discontinuous evolution, we model the evolution of sigmoidal response norms in response to changes in underlying traits or continuous environments.
- For traits that depend on underlying factors, their expression varies randomly as follows: B.
- Generated noise, multiplicity unstable, phenotypic selection of two selective peaks constant, evolution of response norm shows phenotypic distribution revolving around only one peak.
- However, frequency-dependent selection between two adaptive peaks can develop steep thresholds that support pleiotropy.
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