The heritability of fitness: some single gene models.
Because directional selection exhausts additive-genetic variance, it is frequently claimed that the heritability of fitness should be very close to zero. However, mutation-selection balance generates a certain amount of additive-genetic variance, so that even parent-offspring measures of heritability may be greater than zero at equilibrium. Intra-generation heritability may also be non-zero, providing the potentials for genetic change following environmental change.
Waite Agricultural Research Institute, The University of Adelaide, 5064, Glen Osmond, Australia.
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