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  3. the allele b gives drosophila flies a black body,

The allele b gives Drosophila flies a black body, and b+ gives brown, the wild-type phenotype....

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Biology

  1. The allele b gives Drosophila flies a blackbody, and b+ gives brown, the wild-type phenotype. Theallele wx of a separate gene gives waxy wings, andwx+ gives nonwaxy, the wild-type phenotype. The allelecn of a third gene gives cinnabar eyes, and cn+gives red, the wild-type phenotype. A female heterozygous for thesethree genes is testcrossed, and 2,424 progeny (you could also usen=2,423) are classified as follows:

    cn+ · wx+ · b101
    cn · wx+ · b+768
    cn · wx+ · b20
    cn+ · wx+ · b+323
    cn+ · wx · b848
    cn · wx · b+101
    cn · wx · b242
    cn+ · wx · b+20


    Calculate the recombinant frequenciesfor  b-wx,  b-cn, and  wx-cn.

    Which gene is in the middle: b, wx, or cn?

    Screen shot of table in case of formatting issues:

    NOTE: the genotypes in the table below were released on FridayJuly 10, but there are errors which have been corrected above.

    cn+ · wx · b101
    cn · wx+ · b+768
    cn · wx · +b20
    cn+ · wx+ · b+323
    cn+ · wx · b848
    cn · wx · b101
    cn · wx+ · b242
    cn+ · wx · b20

Answer & Explanation Solved by verified expert
3.6 Ratings (530 Votes)
AnswerA gene b is in    See Answer
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