The results concluded that the effect of averageness was preferred nearly twice over juvenile trait characteristics which indicates that stabilizing selection influences facial preference, and averageness was found more attractive than the retention of juvenile facial characteristics ( Wehr, 2001 ).
32.
A ratio greater than 1 implies positive or Darwinian selection ( driving change ); less than 1 implies purifying or stabilizing selection ( acting against change ); and a ratio of exactly 1 indicates neutral ( i . e . no ) selection.
33.
More recently, a mathematical explanation for the extreme length of the flowering cycles has been offered, involving both the stabilizing selection implied by the predator satiation hypothesis and others, and the fact that plants that flower at longer intervals tend to release more seeds.
34.
Stabilizing selection has been invoked as a force maintaining similarity in species complexes, especially when adaptation to special environments, such as a host in the case of symbionts, or extreme environments, constrains possible directions of evolution : In such cases, strongly divergent selection is not to be expected.
35.
Bacteria have been around far longer, but failed ( except when one lineage became the first eukaryote ) to evolve greater complexity despite mutations in every part of every gene in every generation for over three billion years, roughly a trillion generations such is the power of constructional constraints and stabilizing selection to prevent radical evolutionary change.
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