Sex: The power of randomization

In evolutionary biology, randomness has been perceived as a force that, in and of itself, is capable of inventing: mutation creates new genetic information at random across the genome which leads to phenotypic change, which is then subject to selection. However, in science in general and in computer...

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Bibliographic Details
Published in:Theoretical population biology Vol. 129; pp. 41 - 53
Main Authors: Vasylenko, Liudmyla, Feldman, Marcus W., Papadimitriou, Christos, Livnat, Adi
Format: Journal Article
Language:English
Published: United States Elsevier Inc 01.10.2019
Subjects:
Biological Evolution
Epistasis
Epistasis, Genetic
Germ-Line Mutation
Humans
Models, Theoretical
Random sampling
Randomized algorithms
Sex and recombination
Sexual Behavior
Randomized algorithms
Sex and recombination
Epistasis
Random sampling
ISSN:0040-5809, 1096-0325, 1096-0325
Online Access:Get full text
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Summary:In evolutionary biology, randomness has been perceived as a force that, in and of itself, is capable of inventing: mutation creates new genetic information at random across the genome which leads to phenotypic change, which is then subject to selection. However, in science in general and in computer science in particular, the widespread use of randomness takes a different form. Here, randomization allows for the breaking of pattern, as seen for example in its removal of biases (patterns) by random sampling or random assignment to conditions. Combined with various forms of evaluation, this breaking of pattern becomes an extraordinarily powerful tool, as also seen in many randomized algorithms in computer science. Here we show that this power of randomness is harnessed in nature by sex and recombination. In a finite population, and under the assumption of interactions between genetic variants, sex and recombination allow selection to test how well an allele will perform in a sample of combinations of interacting genetic partners drawn at random from all possible such combinations; consequently, even a small number of tests of genotypes such as takes place in a finite population favors alleles that will most likely perform well in a vast number of yet unrealized genetic combinations. This power of randomization is not manifest in asexual populations.
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ISSN:0040-5809
1096-0325
1096-0325
DOI:10.1016/j.tpb.2018.11.005