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Maternal effects on fingertip dermatoglyphics.

T Reed, M M Evans, J A Norton

    American Journal of Human Genetics
    |May 1, 1979
    PubMed
    Summary
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    Maternal influences affect dermatoglyphic fingertip variables, particularly thumb measurements, in male identical twins more than female identical twins. These findings suggest sex-specific maternal effects on traits like ridge count.

    Area of Science:

    • Human Genetics
    • Dermatoglyphics
    • Developmental Biology

    Background:

    • Dermatoglyphic variables, such as fingertip ridge counts, exhibit heritability.
    • Previous research indicated differences in monozygotic (MZ) twin variances based on placental type, suggesting prenatal environmental influences.
    • Sex differences in the expression of certain traits have been observed in human populations.

    Purpose of the Study:

    • To investigate sex differences in the variation of dermatoglyphic fingertip variables within families of monozygotic (MZ) twins.
    • To identify specific dermatoglyphic traits influenced by maternal factors, potentially differing between sexes.
    • To explore the association between these dermatoglyphic variations and maternal influences in both twins and singletons.

    Main Methods:

    Related Experiment Videos

    • Analysis of dermatoglyphic fingertip variables in families of male and female MZ twins.
    • Comparison of variance between sibships within families for 41 dermatoglyphic variables.
    • Statistical analysis to identify significant differences in variation and potential maternal influences.

    Main Results:

    • Ten of 41 dermatoglyphic fingertip variables showed significantly larger variation between sibships in male MZ twin families compared to female MZ twin families.
    • Five of these variables were thumb-related, primarily affecting thumb radial and ridge count.
    • These findings suggest sex-specific maternal influences on specific dermatoglyphic traits, extending to singletons.

    Conclusions:

    • Maternal influences on dermatoglyphic traits, especially thumb characteristics, appear to be sex-specific, with greater impact observed in males.
    • The study highlights the role of prenatal maternal environment in shaping dermatoglyphic patterns.
    • Further research is warranted to fully elucidate the mechanisms behind these observed sex differences and maternal effects.