The allele b gives Drosophila flies a black
body, and b+ gives brown, the wild-type phenotype....
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Biology
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+ · b
101
cn · wx+ · b+
768
cn · wx+ · b
20
cn+ · wx+ · b+
323
cn+ · wx · b
848
cn · wx · b+
101
cn · wx · b
242
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 · b
101
cn · wx+ · b+
768
cn · wx · +b
20
cn+ · wx+ · b+
323
cn+ · wx · b
848
cn · wx · b
101
cn · wx+ · b
242
cn+ · wx · b
20
Answer & Explanation
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3.6 Ratings (530 Votes)
AnswerA gene b is in
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