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    Recombination frequencies

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    This question involves Drosophila. Order and give the map distance for these three loci involved in this question:

    wingless (w) legless (l) buggy (b)
    The phenotypes indicated above are recessive.
    A cross between a wild-type female and a male that expresses all of the above
    recessive phenotypes gives the following progeny:
    1. 805 wingless legless buggy-
    2. 813 wild type-
    3. 112 wingless-
    4. 114 legless buggy-
    5. 125 wingless buggy-
    6. 122 legless-
    7. 3 wingless legless-
    8. 3 buggy-
    (a) What is the order of the genes on the chromosome
    (b) Calculate the recombination frequencies of each region. Then draw a
    chromosome map of the alleles, giving distances between each allele (use the first
    letter of each word as the allele designation). What is the total distance?
    (c) Identify which classes are parental (p), single crossover in region 1 (sco1), single
    crossover in region 2 (sco2), and double-crossovers (dco).
    (d) Is there interference here? Calculate the coefficient of coincidence and give the

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    Solution Preview

    Hi there,

    Thanks for letting me work on your post. Here is my explanation:

    (a,b) let us designate w, l and b as wingless, legless, buggy respectively.
    recombination frequency for w-l: ...

    Solution Summary

    Recombination frequencies are examined.