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Types of Selection

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...

Mate Choice

Mate Choice

Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.

Incomplete Dominance

Incomplete Dominance

Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.

What is Natural Selection?

What is Natural Selection?

Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.

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Related Experiment Video

Updated: Mar 9, 2026

Measuring Active and Passive Tameness Separately in Mice

Measuring Active and Passive Tameness Separately in Mice

Published on: August 10, 2018

Selection signature in domesticated animals.

Zhang-yuan Pan¹, Xiao-yun He², Xiang-yu Wang²

¹1. Key Laboratory of Farm Animal Genetic Resources and Germplasm Innovation of Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China; 2. College of Life Science, Linyi University, Linyi 276005, China.

Yi Chuan = Hereditas

|December 31, 2016

Summary

This summary is machine-generated.

Analyzing selection signals in domesticated animals helps identify genes crucial for adaptation and human needs. This research reviews methods and findings in various species, offering insights into functional gene screening.

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Last Updated: Mar 9, 2026

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Area of Science:

Genomics
Animal Science
Evolutionary Biology

Background:

Domesticated animals are vital to human society, originating from wild ancestors through selective breeding.
Domestication and subsequent natural/artificial selection imprint genomic selection signals.

Purpose of the Study:

To provide an overview of selection signal types and detection methods.
To summarize research on selection signals in domestic animals.
To discuss challenges and future directions in selection signal analysis.

Main Methods:

Review of existing literature on selection signals in domestic animals.
Analysis of different types and detection methodologies for genomic selection signals.
Synthesis of findings from studies on pigs, chickens, cattle, sheep, goats, and dogs.

Main Results:

Selection signals in animal genomes are key indicators of adaptation and human-driven breeding.
Numerous functional genes have been identified through selection signal analysis across various domestic species.
Established methods effectively detect selection signals, aiding in functional gene discovery.

Conclusions:

Genomic selection signal research is a powerful strategy for identifying functional genes in domesticated animals.
Understanding these signals is crucial for livestock breeding and genetic improvement.
Continued research and advanced analytical approaches will further unlock the genetic potential of domestic animals.