Scientist Studying High-Elevation Adaptations in Tibetans Discovered That the EPAS1

Multiple Choice

Scientist studying high-elevation adaptations in Tibetans discovered that the EPAS1 allele favored at high elevations first appeared in the Denisovan genome and entered the human genome when Denisovan and ancestral Tibetans interbred. This is an example of

A) genetic hitchhiking.
B) introgression.
C) incomplete lineage sorting.
D) linkage disequilibrium.