If the population of the last common ancestor of humans, chimpanzees, and gorillas was very large, and humans split from chimpanzees very quickly after the gorilla lineage diverged,
how might this influence the relationship between gene trees and species trees in this clade?
What will be an ideal response?
ANS:
Deep coalescence is more likely along short, wide branches. A large population would produce a wide branch, and the quick split would produce a short branch in the phylogenetic species tree. The gene trees of 25% of loci do not reflect the species tree for these species.
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