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Related Concept Videos

Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
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Frequency-dependent Selection01:21

Frequency-dependent Selection

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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Diversity of Protists IV01:27

Diversity of Protists IV

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Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
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Evolutionary Relationships through Genome Comparisons02:54

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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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Genetic Variation01:25

Genetic Variation

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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles,...
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Cis-regulatory Sequences02:02

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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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Related Experiment Video

Updated: Oct 19, 2025

Identifying Amino Acid Overproducers Using Rare-Codon-Rich Markers
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Identifying Amino Acid Overproducers Using Rare-Codon-Rich Markers

Published on: June 24, 2019

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Correction: Variation and selection on codon usage bias across an entire subphylum.

Abigail L LaBella, Dana A Opulente, Jacob L Steenwyk

    Plos Genetics
    |September 27, 2021
    PubMed
    Summary

    This study corrects a previous article DOI. The corrected DOI is 10.1371/journal.pgen.1008304.

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    Area of Science:

    • Scientific publishing
    • Article correction
    • Digital Object Identifier (DOI)

    Context:

    • Correction of a previously published article
    • Ensuring accurate citation and discoverability
    • Maintaining scientific record integrity

    Purpose:

    • To provide the correct Digital Object Identifier (DOI) for a specific article
    • To rectify a bibliographic error
    • To facilitate accurate referencing and access to the research

    Summary:

    • The article DOI has been corrected to 10.1371/journal.pgen.1008304.
    • This correction ensures proper identification of the research.
    • Accurate DOIs are crucial for scientific literature.

    Impact:

    • Improved accuracy in scientific literature databases
    • Enhanced ability for researchers to locate and cite the article
    • Upholding the reliability of published scientific work