Drosophila melanogasterfemales heterozygous for the linked a, b, and c loci were

Question

Drosophila melanogasterfemales heterozygous for the linked a, b, and c loci were testcrossed to homozygous recessive males. The following progenyphenotypes were observed:

Phenotypes: ab+ 330 a+c 87 ++c 360 +b+ 83 a b c 10 a++ 56 + + + 20 +bc 54 Total is 1000

Which alleles are carried on the same chromosome in thefemale parents? ALSO which locus (a.b, or c) is thecenter?
a. the arrangement isabc/+++
b. the arrangement isa+c/+b+
c. the arrangement is+bc/a++.
d. the arrangement isab+/++c
e. it cannot bedetermined.

Explanation / Answer

d. the arrangement isab+/++c

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