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What is Population Genetics?

What is Population Genetics?

A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.

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.

Hardy-Weinberg Principle

Hardy-Weinberg Principle

Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.

Law of Segregation

Law of Segregation

When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.

Pedigree Analysis

Pedigree Analysis

Mutation, Gene Flow, and Genetic Drift

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).

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Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information

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Revisiting Dominance in Population Genetics.

Chenlu Di¹, Kirk E Lohmueller^1,2,3

¹Department of Ecology and Evolutionary Biology, University of California, Los Angeles, CA, USA.

Genome Biology and Evolution

|August 8, 2024

Summary

This summary is machine-generated.

Dominance, a key concept in population genetics, influences mutation frequency and genetic variation. Estimating dominance coefficients is challenging but crucial for understanding evolution and inbreeding effects.

Keywords:

deleterious mutations dominance inference natural selection population genetics

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Area of Science:

Population Genetics
Evolutionary Biology
Genetics

Background:

Dominance describes heterozygous genotype effects relative to homozygous ones.
Understanding dominance is fundamental to population genetics, with early work by Fisher, Wright, and Haldane.
Estimating dominance coefficients has been historically challenging, limiting empirical studies.

Purpose of the Study:

To review theoretical models explaining the mechanisms of dominance.
To discuss methods for estimating dominance coefficients and summarize existing estimates.
To test hypotheses about dominance by comparing coefficients across gene types and species.

Main Methods:

Review of theoretical and conceptual models of dominance.
Analysis of various approaches for estimating dominance coefficients.
Comparison of empirical dominance coefficient estimates across species, mutation types, and gene functions.

Main Results:

Observed trends in dominance coefficients across different biological contexts.
Empirical data used to test hypotheses regarding the existence of dominance.
Insights into how dominance influences mutation dynamics and inbreeding depression.

Conclusions:

Dominance significantly impacts the dynamics of beneficial and deleterious mutations.
The degree of dominance affects inbreeding consequences on population fitness.
Further research is needed to refine methods for estimating dominance coefficients and their evolutionary implications.