In Drosophila melanogaster the allele for red eyes is dominant over the allele for purple eyes, and the

allele for a gray body is dominant over the allele for a black body. A testcross was done to check for
genetic linkage between the genes for these traits, with the following results for the offspring:478
flies with red eyes and a black body
27 flies with red eyes and a gray body
462 flies with purple eyes and a gray body
33 flies with purple eyes and a black body
Which of the choices below best represents the map distance between the genes for these two traits?



a. 50.0 map units
b. 30.0 map units
c. 47.0 map units
d. 27.0 map units
e. 6.0 map units


E

Biology & Microbiology

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