Q6 · 2023 · Paper 1Unclassified1 mark
QUESTION 6
The reconstructed phylogenetic tree shows evolutionary relationships between eight Himalayan songbirds and the elevations they inhabit. The data shows that
(A)
(B) the most closely related species diverged 14 million years ago.
(C) species at low elevation are more closely related than species at high elevation.
(D) species at middle elevation are less closely related than species at other elevations.
WORKED SOLUTION
1 markAnswer A
OFFICIAL ANSWERA
The two most recent sister pairs are B–C and F–G. Each pair occupies different elevation bands. Their divergence is at the supplied 7-million-year tick, so A is the unique supported statement.
Correct option from the official QCAA answer key.