The Y chromosome can be used to trace ancestry because:

A. natural selection favors specific mutations
in specific places.
B. mutations in the Y chromosome occurred
as people migrated around the globe.
C. mutations in the Y chromosome are
independent of mutations in mitochondria.
D. mutations in the Y chromosome occur only
in a few locations.
E. nonmutant Y-chromosome genotypes are
eliminated from human populations.


B

Biology & Microbiology

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