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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also regularly...
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Related Experiment Video

Updated: Jul 12, 2026

Optimized Analysis of Proteins from Xenopus Oocytes and Embryos by Immunoblotting
09:32

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Published on: September 19, 2025

The cyril burt question: new findings.

D D Dorfman

    Science (New York, N.Y.)
    |September 29, 1978
    PubMed
    Summary

    Cyril Burt

    Area of Science:

    • Psychology
    • Behavioral Genetics
    • Sociology

    Background:

    • Cyril Burt's 1966 paper presented intelligence and social mobility data.
    • The data appeared to support a genetic theory of IQ and social class.

    Purpose of the Study:

    • To re-examine Cyril Burt's influential 1966 data.
    • To determine the authenticity and origin of Burt's presented statistics.

    Main Methods:

    • Statistical analysis of Burt's published data.
    • Comparison with theoretical models and historical data sources.

    Main Results:

    • Burt's data showed perfect agreement with a theoretical normal curve.
    • Evidence suggests fabrication from a genetic regression equation.

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  • Data points matched figures published over 30 years prior to Burt's surveys.

    • Conclusions:

    • Burt's data on IQ and social mobility were demonstrably fabricated.
    • The findings cast significant doubt on the validity of his conclusions regarding genetic inheritance.