2. A linkage map
(A) reflects the frequency of crossing over between X and Y sex chromosomes.
(B) can pinpoint actual loci of genes.
(C) is a genetic map based on recombination frequencies.
(D) requires preparation of karyotypes.
(E) always has a total of 100 map units.

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統計： A(3), B(4), C(40), D(0), E(0) #2241841