G11 SUPER GIO
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03
CHALLENGE MISSIONselection, drift, gene flow, and common ancestry

selection, drift, gene flow, and common ancestry

INDEPENDENT DEFENSEINDEPENDENT TRANSFER

Test common ancestry

DNA differences from species Q: species R=3, S=17, T=29 across the same 500-base region. Fossil dates are consistent with all three lineages existing.

  1. Fewer differences suggest more recent common ancestry, given comparable rates.
  2. One gene is evidence, not the whole phylogeny.
  3. R is closest in this dataset.

Which claim is defensible?

MODELEvolution Evidence Matrix
DNA
PROVEChoose with evidence
CLUE

Pause. Find what matters. Then make your move.