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    Chromosome mapping and coefficient of coincidence

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    In the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a male that is claret (dark eyes) and hairless (no thoracic bristles). Phenotypically wild type F1 female progeny were mated to fully homozygous (mutant) males and the following progeny (1000 total) were observed.

    PHENOTYPES NUMBER OBSERVED

    spineless 321
    wild 38
    claret, spineless 130
    claret 18
    claret, hairless 309
    hairless, claret, spineless 32
    hairless 140
    hairless, spineless 12

    (a) What are the map distances between the three genes? Draw the map.
    (b) What is the coefficient of coincidence?

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    https://brainmass.com/biology/genetics/chromosome-mapping-coefficient-coincidence-134552

    Solution Preview

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    In the fruit fly, Drosophila melanogaster, a spineless (no wing bristles) female fly is mated to a male that is claret (dark eyes) and hairless (no thoracic bristles). Phenotypically wild type F1 female progeny were mated to fully homozygous (mutant) males and the following progeny (1000 total) were observed.

    PHENOTYPES NUMBER OBSERVED

    spineless 321
    wild 38
    claret, spineless 130
    claret 18
    claret, hairless 309
    hairless, claret, spineless 32
    hairless 140
    hairless, spineless 12

    (a) What are ...

    Solution Summary

    Chromosome mapping can be done through F1 test cross results. In three point test sequence among genes as well as distance between genes in map units are calculated. Coefficient of coincidence tell us about double cross over.

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