In a mixed infection experiment, you study two plaque phenotypes of large (l+) versus small (l?) and bumpy (b+) versus smooth (b?). You mix small (l? b+) with smooth (l+ b?) and identify 50 small, smooth and 47 large, bumpy. How far apart are
the genes?
A) 99
B) 1000
C) 490
D) 49
E) There is not enough information to calculate the distance.
Answer: D
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