In the Study of Polytene Chromosomes Among Drosophila It Was

Multiple Choice

In the study of polytene chromosomes among Drosophila it was determined that:
1) Different arrangements predominated different geographical regions.
2) Frequencies of the arrangements changed seasonally.
3) Long-term changes in the frequencies of arrangements occur in some populations.

A) 1
B) 2
C) 3
D) 1 and 2
E) All of these