If the map distance between genes P and Q is 15 units, and between Q and R is 10 units, what is the map distance between P and R if Q is in the middle?
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Correct answer: 25 units
Genetic map distances are additive. If the order of genes is P-Q-R, the distance between the two outer genes (P and R) is the sum of the intervening distances: 15 + 10 = 25 units.
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