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Path analysis of total palmar pattern ridge counts

K C Malhotra, D C Rao

    American Journal of Physical Anthropology
    |June 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

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    Genetic factors account for about one-third of the variation in the Total Palmar Pattern Ridge Count (TPPRC). However, other factors like the intrauterine environment or genetic dominance also influence TPPRC, especially in identical twins.

    Area of Science:

    • Human genetics
    • Dermatoglyphics
    • Behavioral genetics

    Background:

    • A novel dermatoglyphic measure, the Total Palmar Pattern Ridge Count (TPPRC), has been recently defined.
    • TPPRC is calculated as the sum of ten individual palmar ridge counts.

    Purpose of the Study:

    • To analyze familial correlations of TPPRC using path analysis models.
    • To estimate the heritability of TPPRC.

    Main Methods:

    • Path analysis models were applied to familial correlation data, including twin studies.
    • Estimation of additive genetic factors (h2) influencing TPPRC variation.

    Main Results:

    • Additive genetic factors explain approximately 37% (h2 = .37 +/- .06) of the variation in TPPRC.

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  • The high correlation observed in monozygotic (MZ) twins (r = .8) suggests additional factors beyond additive genetics are involved.

    • Conclusions:

    • While additive genetics play a role in TPPRC, they do not fully explain the resemblance between MZ twins.
    • Factors such as MZ twin-specific intrauterine environment or genetic dominance may contribute to familial resemblance in TPPRC, but require further investigation.