The map of a chromosome interval is Q-10 m.u.-R-40 m.u.-S.Which interval would likely show the higher ratio of double to single chiasmata?
A) Q-R
B) R-S
C) The ratios would be the same in the two intervals.
D) Two chiasmata never occur in the same interval.

Question

Quizplus · Accepted Answer

The interval with the highest ratio of double to single chiasmata is typically the middle of the chromosome, which in this case is interval R-S. Therefore, choice B is the best answer.

The Map of a Chromosome Interval Is Q-10 M