The Q gene locus is 10 map units from the R gene locus which is 40 map units from the S gene locus: 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 R-S, being longer (40 map units), would likely show a higher ratio of double to single chiasmata compared to the shorter Q-R interval (10 map units), as the probability of crossover events increases with distance.

The Q Gene Locus Is 10 Map Units from the R