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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.

Population Growth

Population Growth

Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.

Genomics

Genomics

Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...

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).

Genome Size and the Evolution of New Genes

Genome Size and the Evolution of New Genes

Genome Size and the Evolution of New Genes

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

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Updated: Apr 10, 2026

Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations

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A Beginner's How-To Guide to Urban Population Genetics and Genomics.

Elizabeth J Carlen¹, Lindsay S Miles², Kevin Aviles-Rodriguez³

¹Living Earth Collaborative Washington University in St. Louis St. Louis Missouri USA.

Ecology and Evolution

|April 9, 2026

Summary

This summary is machine-generated.

This guide offers practical methods for urban population genetics, integrating genomics and urban ecology. It helps researchers manage biodiversity, control pests, and promote coexistence in urban environments.

Keywords:

adaptation conservation evolution genetic diversity landscape connectivity management wildlife

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Area of Science:

Urban ecology
Population genetics
Conservation biology

Background:

Urbanization significantly alters ecological and evolutionary processes for species.
Integrating population genetics and genomics with urban ecology is crucial for understanding urban species evolution.
Accessible guidance is needed for applying genetic and genomic tools in urban ecology.

Purpose of the Study:

To provide a how-to guide for studying urban population genetics.
To outline key concepts and methodologies for urban genetic research.
To facilitate interdisciplinary approaches in urban ecology and evolution.

Main Methods:

Identifying suitable genetic markers for urban populations.
Selecting appropriate analytical tools for genetic data.
Applying spatial genetic modeling approaches.

Main Results:

The guide details practical applications for assessing genetic diversity, population connectivity, and adaptation.
It emphasizes strategies for conservation, pest control, and assisted gene flow.
It bridges population genomics and urban ecology for practical management.

Conclusions:

This guide equips researchers and managers with tools to study and manage urban populations.
It fosters collaboration between ecologists, geneticists, and city planners.
It aims to enhance the development of sustainable cities supporting biodiversity and coexistence.