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Associations between heterozygosity and morphological variance.

R M Zink, M F Smith, J L Patton

    The Journal of Heredity
    |November 1, 1985
    PubMed
    Summary
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    This study investigated the link between genetic heterozygosity and morphological variance in fox sparrows and pocket gophers. Contrary to some theories, researchers found no significant covariation between these two measures in the studied populations.

    Area of Science:

    • Evolutionary biology
    • Quantitative genetics
    • Population genetics

    Background:

    • Recent research explores the relationship between phenotypic trait expression (morphological variance) and genetic variation (heterozygosity).
    • Lerner's genetic homeostasis theory suggests increased heterozygosity buffers development, reducing morphological variance within populations.
    • The relationship between genic heterozygosity and morphological variance *among* populations remains less clear.

    Purpose of the Study:

    • To investigate the covariation between genetic heterozygosity and morphological variance across populations.
    • To test predictions derived from genetic homeostasis theory in natural populations.

    Main Methods:

    • Compared estimates of heterozygosity and morphological variance in 15 fox sparrow and 17 pocket gopher populations.

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  • Morphological variance was assessed using coefficients of variation and principal components analysis.
  • Heterozygosity was determined via electrophoretic analysis of protein-coding loci.

    • Main Results:

    • No significant covariation was detected between genetic heterozygosity and morphological variance.
    • This finding contrasts with some previous studies reporting a significant relationship.

    Conclusions:

    • The study's findings do not support a general prediction of covariation between heterozygosity and morphological variance across populations.
    • Further research may be needed to understand the complex interplay of genetic and developmental factors influencing phenotypic variation.