Is it possible that the answer is c?
Scarlet (S), cream (Cr), and maroon (M) are three genes located on chromosome 3 of Drosophila melanogaster.
The distances between each pair of genes is given below.
S and Cr
Cr and M
M and S
The sequence of these genes is
a. S M Cr or Cr M S
b. S Cr M or M Cr S
c. Cr S M or M S Cr
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