Why can the two-locus segregation distorter system in Drosophila exist only when distorter and responder gene are tightly linked?
a. The sensitive allele of the responder gene and the segregation distorter driver allele must al-ways co-occur on the same chromosome.
b. Without tight linkage, the "killing" efficiency of the driver allele would be too low.
c. The driver allele would reduce its own fitness by committing suicide in some gametes.
d. All of the above.
C
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