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Chromosomal polymorphism in Nucella lapillus.

C R Bantock, W C Cockayne

    Heredity
    |April 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Chromosomal polymorphism in Nucella lapillus varies, with Robertsonian rearrangements linked to wave force. This study details chromosome counts and distribution, explaining patterns by water movement.

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    Area of Science:

    • Marine biology
    • Cytogenetics
    • Evolutionary biology

    Background:

    • Nucella lapillus exhibits chromosomal polymorphism.
    • Understanding this variation is key to evolutionary studies.

    Purpose of the Study:

    • To describe a technique for examining Nucella lapillus chromosomes.
    • To analyze the distribution and drivers of chromosomal polymorphism in Nucella lapillus.

    Main Methods:

    • Examination of chromosomes in testicular material.
    • Karyotyping to determine diploid chromosome numbers (2n=26 to 36).
    • Analysis of chromosome arrangement polymorphism (Robertsonian).
    • Distribution mapping across southern Britain.
    • Correlation analysis between polymorphism frequency and environmental factors (wave force, water movement).

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    Main Results:

    • The diploid chromosome number in Nucella lapillus ranges from 26 to 36.
    • Eight pairs of metacentric chromosomes are consistently present.
    • A Robertsonian polymorphism explains the variation, with acrocentric chromosomes in the 2n=36 form corresponding to metacentric chromosomes in the 2n=26 form.
    • The polymorphism is prevalent in southwestern bays, with monomorphic 2n=26 populations elsewhere.
    • Acrosome frequency is negatively correlated with wave force, indicating adaptation to water movement.

    Conclusions:

    • The described technique facilitates chromosomal analysis in Nucella lapillus.
    • Robertsonian polymorphism in Nucella lapillus is influenced by environmental factors, particularly water movement.
    • The distribution of chromosomal polymorphism is explained by selective pressures related to wave force and water movement, favoring higher chromosome frequency in areas with less water movement.