Dictionary of Human Evolution and Biology

  • -id > 9:3
   

Shifting Balance Theory

Metaphorical proposal that certain combinations of alleles at different loci produce positive fitness effects in an organism, and that these same alleles in other combinations may in some cases lower another organism’s fitness. Suggested by Sewall Wright in conjunction with his adaptive landscape metaphor.

Cf. Fisher’s fundamental theorem of natural selection.

Full-Text Search Entries