Truncation selection is a selection method in

selective breeding Selective breeding (also called artificial selection) is the process by which humans use animal breeding and plant breeding to selectively develop particular phenotypic traits (characteristics) by choosing which typically animal or plant m ...

and in

evolutionary algorithm Evolutionary algorithms (EA) reproduce essential elements of the biological evolution in a computer algorithm in order to solve "difficult" problems, at least Approximation, approximately, for which no exact or satisfactory solution methods are k ...

s from computer science, which selects a certain share of fittest individuals from a population for reproduction in the next generation.

Animal and plant breeding

animal Animals are multicellular, eukaryotic organisms in the Biology, biological Kingdom (biology), kingdom Animalia (). With few exceptions, animals heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, ...

and

plant breeding Plant breeding is the science of changing the traits of plants in order to produce desired characteristics. It is used to improve the quality of plant products for use by humans and animals. The goals of plant breeding are to produce crop varie ...

, truncation selection is a standard method. Animals are ranked by their phenotypic value on some trait such as milk production, and the top percentage is reproduced. The effects of truncation selection for a continuous trait can be modeled by the standard breeder's equation by using

heritability Heritability is a statistic used in the fields of Animal husbandry, breeding and genetics that estimates the degree of ''variation'' in a phenotypic trait in a population that is due to genetic variation between individuals in that population. T ...

and

truncated normal distribution In probability and statistics, the truncated normal distribution is the probability distribution derived from that of a normally distributed random variable by bounding the random variable from either below or above (or both). The truncated no ...

s. On a binary trait, it can be modeled easily using the liability threshold model. It is considered an easy and efficient method of breeding.

Computer science

In computer science, truncation selection is a selection method used in

s to select potential candidate solutions for recombination modeled after the breeding method. In truncation selection the candidate solutions are ordered by fitness, and some proportion T% of the top fittest individuals are selected and reproduced randomly. It is used in Muhlenbein's breeder genetic algorithm.

References

External links

"Chapter 14: Short-term Changes in the Mean: 2. Truncation and Threshold Selection"
* Crow 2010
"On epistasis: why it is unimportant in polygenic directional selection"
* Visscher et al. 2008
"Heritability in the genomics era - concepts and misconceptions"
* Visscher 2016
"Human Complex Trait Genetics in the 21st Century"
* Weight & Harpending 2016
"Some Uses of Models of Quantitative Genetic Selection in Social Science"
* Frost & Harpending 2015
"Western Europe, state formation, and genetic pacification"
Breeding Selection (evolutionary algorithm) {{bioinformatics-stub