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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.

Gene Flow

Gene Flow

Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.

Types of Genetic Transfer Between Organisms

Types of Genetic Transfer Between Organisms

Genetic transfer occurs when genetic information is passed from one organism to another. It occurs via two mechanisms: vertical gene transfer and horizontal gene transfer. Vertical gene transfer occurs when genetic information is transferred from one generation to the next, which happens much more frequently than horizontal gene transfer. Both sexual and asexual reproduction are forms of vertical gene transfer, where one or more organisms pass some or all of their genome onto their progeny.

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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Genetic Drift

Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.

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Related Experiment Video

Updated: Sep 10, 2025

Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli

Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli

Published on: August 18, 2023

Gene-culture association and coevolution.

Laurel Fogarty¹, Stephen Zhang², Marcus W Feldman²

¹Max Planck Institute for Evolutionary Anthropology, Department of Human Behavior, Ecology, and Culture, 04103 Leipzig, Germany.

Theoretical Population Biology

|August 25, 2025

Summary

This summary is machine-generated.

Gene-culture coevolution explores how genes and culture interact to shape human evolution. New models reveal complex dynamics, including gene-culture association and unexpected evolutionary pathways, even without direct selection on cultural traits.

Keywords:

Cultural evolution Gene-culture association Invasion analysis Transmission biases

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Last Updated: Sep 10, 2025

Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli

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Published on: August 18, 2023

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Published on: September 20, 2016

Area of Science:

Evolutionary Biology
Human Evolution
Cultural Evolution

Background:

Human evolution is influenced by the interplay between genetic and cultural traits.
Existing theoretical frameworks for gene-culture coevolution are incomplete, particularly regarding quantitative interactions.
Understanding gene-culture dynamics is crucial for recognizing culture's impact on human evolutionary trajectories.

Purpose of the Study:

To develop and analyze theoretical models of gene-culture coevolution.
To investigate the quantitative interactions between cultural transmission biases, viability selection, and genetic evolution.
To explore the conditions under which gene-culture coevolution can occur and its resulting dynamics.

Main Methods:

Development of two mathematical models for gene-culture coevolution.
Analysis of model parameters including cultural transmission biases and viability selection.
Examination of genetic and cultural trait interactions within evolutionary systems.

Main Results:

Gene-culture coevolution can manifest even without direct selection on cultural traits.
Models predict internal equilibria where both genetic and cultural types coexist (polymorphism).
Gene-culture association can be sustained, leading to complex and unanticipated evolutionary dynamics.

Conclusions:

Gene-culture coevolutionary systems exhibit rich and often unexpected dynamics.
Theoretical modeling provides crucial insights into the quantitative aspects of gene-culture interactions.
Further theoretical development is necessary to fully grasp the impact of culture on human evolution.