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Types of Selection01:46

Types of Selection

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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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Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
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In statistics, several tools are used to interpret the data. Measures of central tendency represent the characteristics of the data, such as mean, median, and mode. Additionally, measures of variance like standard deviation and range are used to find the spread of data from the mean. Relative standing measures the distance between data locations. Commonly used measures of relative standings are percentile, z score, and quartiles.
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Data are individual items of information obtained from a population or sample. Data may be classified as qualitative (categorical), quantitative continuous, or quantitative discrete. Because it is not practical to measure the entire population in a study, researchers use samples to represent the population. A random sample is a representative group from the population chosen by using a method that gives each individual in the population an equal chance of being included in the sample. Random...
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When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.
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Editor-in-Chief's Top Picks From 2016: Part One.

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    Journal of the American College of Cardiology
    |February 25, 2017
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    Summary

    This JACC issue highlights key cardiovascular research across 15 specialties, including original investigations and reviews. It features editor selections and highly accessed articles for a comprehensive overview.

    Area of Science:

    • Cardiovascular Medicine
    • Translational Research
    • Public Health

    Background:

    • The Journal of the American College of Cardiology (JACC) publishes a wide range of cardiovascular research.
    • Selecting the most impactful research from numerous submissions is a significant challenge.
    • Ensuring broad dissemination of critical findings across diverse subspecialties is essential.

    Purpose of the Study:

    • To curate and present a comprehensive collection of significant cardiovascular research published in JACC.
    • To provide clinicians and researchers with a digestible overview of advancements across 15 distinct specialties.
    • To highlight both editorially selected and highly accessed/downloaded articles.

    Main Methods:

    • Personal selection of original investigations and review articles by the JACC editor.

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  • Inclusion of manuscripts identified as most accessed or downloaded from JACC websites.
  • Inclusion of articles selected by JACC Editorial Board members.
  • Categorization of selected articles into two parts covering 15 distinct cardiovascular specialties.

    • Main Results:

    • The issue is divided into two parts, covering 15 key areas of cardiovascular medicine and research.
    • Part One includes Basic & Translational Research, Cardiac Failure, Cardiomyopathies, Congenital Heart Disease, Coronary Disease & Interventions, and CVD Prevention & Health Promotion.
    • Part Two includes CV Medicine & Society, Hypertension, Imaging, Metabolic & Lipid Disorders, Rhythm Disorders, Valvular Heart Disease, and Vascular Medicine.

    Conclusions:

    • This curated issue provides a valuable summary of recent advancements in cardiovascular medicine.
    • The selection process ensures coverage of both foundational research and clinical applications.
    • Readers gain exposure to critical findings across the full spectrum of cardiovascular specialties.