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Related Concept Videos

Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Natural Selection and Mating Preferences01:06

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The principle of natural selection posits that organisms better adapted to their environment are more likely to survive and reproduce. This principle is closely intertwined with mating preferences, a key aspect of sexual selection, which evolutionary psychologists believe is driven by instincts to propagate one's genes. Such instincts significantly influence mating behaviors and preferences between genders.
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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Types of Selection01:46

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Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
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Natural Selection and the Evolution of Asynchronous Aging.

Jacob A Moorad, Sanjana Ravindran

    The American Naturalist
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    Summary
    This summary is machine-generated.

    Evolutionary theory reveals that natural selection drives faster aging in traits most strongly selected early in life, contradicting previous models. This finding explains variation in aging rates across different traits.

    Keywords:
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    Area of Science:

    • Evolutionary biology
    • Biogerontology
    • Quantitative genetics

    Background:

    • Understanding within-population variation in aging rates is crucial in biogerontology.
    • Early evolutionary models predicted simultaneous trait deterioration, but asynchronous aging is widely observed.
    • Recent models suggest traits vital to fitness senesce slower.

    Purpose of the Study:

    • To test evolutionary predictions regarding the rates of aging across different phenotypic traits.
    • To reconcile theoretical predictions with observed patterns of asynchronous aging.
    • To develop a framework for quantifying selection's role in aging rate variation.

    Main Methods:

    • Formal evolutionary theory was applied to model aging rates.
    • Age-specific sources of selection for age-specific traits were quantified.
    • The relationship between selection patterns and aging rate variation was analyzed.

    Main Results:

    • Formal evolutionary theory contradicts both simultaneous deterioration and slower aging of high-fitness traits.
    • Selection favors faster aging in traits under the strongest early-life selection.
    • Quantification methods demonstrate how age-related selection explains observed aging rate variation.

    Conclusions:

    • Natural selection plays a role in the evolution of among-trait variation in aging, but not as previously theorized.
    • Rapid aging evolves in traits with the highest early-life selective pressure.
    • Quantifying age-specific selection provides insights into the evolution of senescence.