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🧬 Dobzhansky-Muller Incompatibilities

Hybrid sterility/inviability arises from epistatic incompatibilities between alleles that evolved separately. A and a are compatible, B and b are compatible, but A-b and a-B combinations may be lethal.

Generations since split
Generation: 0
Pop A Fixed Alleles: 0
Pop B Fixed Alleles: 0
Expected DMIs: 0
Hybrid Fitness: 1.00
Orr's Snowball: DMIs accumulate faster than linearly with divergence time (n² rate). Each new substitution can be incompatible with all previous ones. This "snowball effect" explains rapid buildup of reproductive isolation.