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Related Concept Videos

Dosage Compensation02:50

Dosage Compensation

In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with  distinct numbers of X chromosomes will have...
Mutation, Gene Flow, and Genetic Drift01:09

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).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
Hardy-Weinberg Principle01:49

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.In the early 20th century,...
Limits to Natural Selection01:38

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
Genome Size and the Evolution of New Genes03:21

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.
Genome Size and the Evolution of New Genes03:21

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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Related Experiment Video

Updated: Jul 4, 2026

Quantification of Information Encoded by Gene Expression Levels During Lifespan Modulation Under Broad-range Dietary Restriction in C. elegans
09:23

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Published on: August 16, 2017

Evolutionary constraints imposed by gene dosage balance.

Han Liang1, Ariel Fernandez

  • 1Department of Ecology and Evolution, University of Chicago, IL 60637, USA. hliang@uchicago.edu

Frontiers in Bioscience : a Journal and Virtual Library
|May 30, 2008
PubMed
Summary

The gene dosage balance hypothesis explains that uneven gene or protein concentrations can harm organisms. Genomic data increasingly supports this, highlighting its role in genetic dominance and gene duplication.

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Last Updated: Jul 4, 2026

Quantification of Information Encoded by Gene Expression Levels During Lifespan Modulation Under Broad-range Dietary Restriction in C. elegans
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Area of Science:

  • Genetics
  • Molecular Biology
  • Genomics

Background:

  • The gene dosage balance hypothesis posits that stoichiometric imbalances in macromolecular complexes are detrimental.
  • This imbalance can mechanistically explain phenomena like genetic dominance and the propensity for gene duplication.
  • Recent genomic data provides substantial evidence supporting this hypothesis.

Purpose of the Study:

  • To review and synthesize the evidence supporting the gene dosage balance hypothesis.
  • To discuss the implications of gene dosage balance for understanding genetic dominance and gene duplicability.
  • To identify future research directions for exploring dosage sensitivity in complex organisms.

Main Methods:

  • Review of recent genomic data and literature.
  • Analysis of evidence supporting the gene dosage balance hypothesis.
  • Discussion of theoretical implications and future research needs.

Main Results:

  • Genomic data strongly supports the gene dosage balance hypothesis.
  • The hypothesis offers a mechanistic explanation for genetic dominance and gene duplicability.
  • Dosage sensitivity is a critical factor in organismal complexity.

Conclusions:

  • The gene dosage balance hypothesis is well-supported by current genomic evidence.
  • Further research is needed to understand gene dosage effects in complex biological systems.
  • Investigating co-regulation of genes under dosage-balance constraints is crucial for future studies.