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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.

Horizontal Gene Transfer

Horizontal Gene Transfer

Horizontal gene transfer (HGT) is a process where genetic material moves between organisms within the same generation, unlike vertical gene transfer, which occurs from parent to offspring. HGT plays a crucial role in microbial evolution, adaptation, and survival, particularly in shared environments like the human gut.Mobile genetic elements such as plasmids, prophages, integrons, insertion sequences, and transposons facilitate this process. HGT occurs through three primary mechanisms:...

Genetics of Speciation

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.

Phloem and Sugar Transport

Phloem and Sugar Transport

Like many living organisms, plants have tissues that specialize in specific plant functions. For example, shoots are well adapted to rapid growth, while roots are structured to acquire resources efficiently. However, sugar production is primarily restricted to the photosynthetic cells that reside in the leaves of angiosperm plants. Sugar and other resources are transported from photosynthetic tissues to other specialized tissues by a process called translocation.

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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Related Experiment Video

Updated: Oct 22, 2025

Mycorrhizal Maps as a Tool to Explore Colonization Patterns and Fungal Strategies in the Roots of Festuca rubra and Zea mays

Mycorrhizal Maps as a Tool to Explore Colonization Patterns and Fungal Strategies in the Roots of Festuca rubra and Zea mays

Published on: August 26, 2022

Grape Phylloxera Genetic Structure Reveals Root-Leaf Migration within Commercial Vineyards.

Jurrian Wilmink^1,2, Michael Breuer¹, Astrid Forneck²

¹Department of Biology, State Institute of Viticulture and Enology, Merzhauser Str. 119, 79100 Freiburg, Germany.

|August 27, 2021

Summary

Grape phylloxera (Daktulosphaira vitifoliae) leaf populations originate from root migrations, not solely wind-drifted sources. This migration can lead to genetic bottlenecks in commercial vineyards, impacting population structure.

Keywords:

Daktulosphaira vitifoliae SSR Vitis vinifera galling insect genotype parthenogenetic reproduction

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Last Updated: Oct 22, 2025

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The Terroir Concept Interpreted through Grape Berry Metabolomics and Transcriptomics

The Terroir Concept Interpreted through Grape Berry Metabolomics and Transcriptomics

Published on: October 5, 2016

Area of Science:

Entomology
Viticulture
Genetics

Background:

Grape phylloxera (Daktulosphaira vitifoliae) is a significant pest affecting grapevines.
Leaf-feeding populations can arise from asexual reproduction or sexual recombination.
The origin of foliar phylloxera in commercial vineyards, whether from root-feeding or wind-drifted sources, remains unclear.

Purpose of the Study:

To analyze the genetic structure of grape phylloxera populations in commercial vineyards.
To determine if leaf-feeding phylloxera are genetically distinct from root-feeding or wind-drifted populations.
To compare population structures from different infestation scenarios and native North American populations.

Main Methods:

Utilized seven SSR markers to analyze the genetic structure of phylloxera populations.
Compared populations from commercial vineyards with varying infestation scenarios and single-plant systems.
Examined phylloxera populations during the vegetation period to understand life cycle migration.
Compared vineyard populations with those from their native North American habitat using four microsatellite markers.

Main Results:

Phylloxera populations predominantly migrate from roots to leaves via asexual reproduction during the growing season.
Root populations within commercial vineyards contribute to leaf populations, causing founder effects or biotype selection.
Wind-drifted foliar populations from external sources result in higher genotypic diversity.
Significant differences were observed when comparing vineyard populations to those in North America.

Conclusions:

Grape phylloxera leaf populations in commercial vineyards are primarily established by root-to-leaf migration within the vineyard.
This internal migration process can lead to genetic bottlenecks and reduced diversity.
Understanding phylloxera population genetics is crucial for effective pest management strategies in viticulture.