Natural Selection Can Act on a Certain Trait Only if the Trait Is
periodical article
International Journal of Plant Sciences
Published Past: The University of Chicago Press
https://doi.org/10.1086/656220
https://www. jstor .org/stable/x.1086/656220
Natural choice is an elegantly simple concept simply i that can manifest in complex ways. I review how the basic model of single-trait viability selection has been extended to more circuitous forms of choice on multiple traits and on reaction norms. Fitness is divers as the expected lifetime reproductive success for individuals with a given genotype or phenotype over a given range of environments. Since the reproductive success realized by any individual will include a stochastic divergence from this expectation, option is therefore a consistent deviation in fitness between organisms with different characteristics. A clear distinction is fatigued between option, which tin can act on any phenotypic divergence, and the response to option, which tin can occur only if phenotypic differences are heritable. This distinction separates the action of natural option in filtering variation from the origin of the novel variants on which selection acts. Since selection oftentimes acts on standing genetic variation or on conditionally neutral variation, both of which accumulate in populations before the imposition of selection, such variation accumulates independently of its fitness furnishings under the subsequent selection regime. Contempo discussions of "Lamarckian" inheritance must be carefully circumscribed to avoid the implication of directed mutation, for which there is no evidence.
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Source: https://www.jstor.org/stable/10.1086/656220
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