In the Laboratory,fruit Flies (Drosophila)were Artificially Selected for the Number

Multiple Choice

In the laboratory,fruit flies (Drosophila) were artificially selected for the number of bristles on their bodies.One population (R) was selected for low numbers of bristles,a second population (S) for high numbers of bristles.

-After 35 generations (about 1 year's time) ,the two populations R and S were studied.Researchers found

A) no change was seen; it's much too soon.
B) some slight increase of bristle numbers was already evident.
C) a vast,overlapping range of bristle numbers was seen.
D) a slight increase in bristles in S,a slight decrease in R,with a little overlap in the middle ranges.
E) a huge increase in S,a huge decrease in R,with no overlap whatsoever.