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ratchet in Biological Definition

Muller's ratchet

... In genetics , Muller 's ratchet is a hypothesis that explains how functionally ... considered a separate organism). Muller's ratchet applies to any deleterious mutation that occurs ... mutations resemble the operation of a ratchet , in that the organism can never go back. By ...

Endosymbiont

... complementary theory as to why the bacteria may have lost genes, Muller's ratchet , is that since the endosymbionts are maternally transmitted and have no ... journal. Nancy A. Moran (1996), Accelerated evolution and Muller’s ratchet in endosymbiotic bacteria, Proceedings of the National Academy of ...

Endosymbiont

... complementary theory as to why the bacteria may have lost genes, Muller's ratchet , is that since the endosymbionts are maternally transmitted and have no ... journal. Nancy A. Moran (1996), Accelerated evolution and Muller’s ratchet in endosymbiotic bacteria, Proceedings of the National Academy of ...

Mutational meltdown

... a downward spiral and will go extinct eventually. See also : Muller's ratchet Further reading W. Gabriel, M. Lynch, and R. Burger (1993). Muller's ratchet and mutational meltdowns. Evolution 47: 1744-1757. M. Lynch, R. ...

Fitness landscape

... rate is too high, or it may drift away from a peak it had already found. The process of drifting away from a peak is often referred to as Muller's ratchet . Fitness landscapes in evolutionary optimization Apart from the field of evolutionary biology, the concept of a fitness landscape has also ...

Genetic recombination

... unbalanced recombination. Enzymes called recombinases catalyze this reaction. Recombination is the mechanism by which organisms avoid Muller's ratchet . Contents showTocToggle("show","hide") 1 Crossing over 1.1 Chemistry of crossover 1.2 Consequences of crossover 1.3 ...

Population genetics

... Founder effect Genotype-phenotype distinction Hardy-Weinberg principle Microevolution Molecular evolution Muller's ratchet Mutational meltdown Population bottleneck Selection Small population size Ewens's sampling formula References J. ...
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