PRACTICE MISSIONselection, drift, gene flow, and common ancestry
selection, drift, gene flow, and common ancestry
NEW CASENEW EVIDENCE
Drift on two islands
Two equal island populations start with allele A frequency 0.50. After a storm leaves 12 random survivors on Island 1, A=0.83. Island 2 retains 900 survivors and A=0.51.
The bottleneck is much stronger on Island 1.
Survival is described as random with respect to allele.