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Gene Flow02:39

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Gene flow is the transfer of genes among populations, resulting from either the dispersal of gametes or from the migration of individuals.
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Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
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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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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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Gene expression is a dynamic process that is significantly influenced by environmental factors. This interaction underlies the complex nature of biological development and the phenotypic differences observed among individuals, even among those with identical genetic makeups. Factors such as radiation, temperature, behavior, nutrition, and stress play pivotal roles in determining how genes are expressed. The concept of the reaction range is central to understanding this interaction. It posits...
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Related Experiment Video

Updated: Sep 15, 2025

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Geography, genes, and germs: An evolutionary entanglement.

Aila Akosua Kattner

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    This summary is machine-generated.

    This issue covers genomic surveillance for SARS-CoV-2, advances in cancer treatments, mpox insights, and pediatric neurosurgery innovations. It also explores cardiac remodeling, atrial fibrillation, and rare genetic disorders.

    Keywords:
    Bietti crystalline dystrophyCardiac remodelingHepatocellular carcinomaMetastasisPediatric surgerySARS-CoV-2

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    Area of Science:

    • Genomic surveillance and phylogenetic analysis for monitoring SARS-CoV-2.
    • Advances in the treatment of hepatocellular carcinoma and gastric cancer.
    • Current insights into mpox (monkeypox).

    Background:

    • The role of extended reality (XR) techniques in pediatric neurosurgery.
    • Updates on cleft care and the relationship between mitochondrial bioenergetics and iron.
    • The link between metastatic potential and cytidine deaminase.

    Discussion:

    • miRNA targets involved in hypertrophy and fibrosis during cardiac remodeling.
    • New deep-learning models for predicting response to cardiac resynchronization therapy.
    • Expression of connexin gap junction proteins in atrial fibrillation.

    Key Insights:

    • A retrospective study on enteral autonomy in pediatric short bowel syndrome.
    • Novel insights into the rare genetic disorder Bietti crystalline dystrophy.
    • Comprehensive review of current research across multiple medical disciplines.

    Outlook:

    • Future directions in infectious disease monitoring and cancer therapy.
    • Potential applications of advanced technologies in pediatric surgery.
    • Understanding complex biological pathways and rare genetic conditions.