Mitochondrial DNA is useful for tracing ancestry because:
A. recombination rarely occurs.
B. mutations in mitochondrial DNA are rare;
mitochondrial DNA has relatively little
variation.
C. mutations in mitochondrial DNA are almost
always harmful.
D. both recombination and mutation in
mitochondrial DNA are rare.
E. both recombination and mutation in
mitochondrial DNA are rare, but when
mutations do occur, they are almost always
harmful.
A
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