Genetic Mapping and Gene Linkage
In a genetic mapping study, the distance between genes D and E is 12 map units, and the distance between genes E and F is 18 map units. Assuming a gene order of D-E-F and simple additivity, what is the expected map distance between genes D and F? If the experimentally observed distance is 40 map units, which statement best explains the discrepancy?
A
Expected distance is 40 map units; no discrepancy exists.
B
Expected distance is 30 map units; discrepancy is due to calculation error.
C
Expected distance is 30 map units; discrepancy may be due to double crossovers.
D
Expected distance is 40 map units; discrepancy may be due to interference preventing crossovers.
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