Reinforcement ·
Selection Against Hybrids
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.com · Phlox drummondii · F3'5'h · R2R3-MYB · Battus philenor
Contact zone
—
Cross-pollen
100%
State
—
Species A — light blue (allopatry)
Species B — P. cuspidata
Sterile hybrids (fitness cost)
Battus philenor pollinator
Reinforced dark-red flower
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.com · Reinforcement