Related Experiment Video
Updated: Feb 8, 2026

Experimental Research Examining How People Can Cope with Uncertainty Through Soft Haptic Sensations
Published on: September 16, 2015
Digest: Untangling the influence of soft and hard selection in experimental populations-from environment to genomics
Belén Jiménez-Mena1, Romina Henriques1
1National Institute of Aquatic Resources, Danish Technical University of Denmark, Silkeborg, Denmark.
Abstract:
Gallet et al. (2018) studied the effect of two selection regimes on the maintenance of polymorphism in experimental populations. They took two strains of Escherichia coli, each resistant to a different antibiotic, evolved them in culture conditions representing "soft" or "hard" selective regimes, and measured polymorphism levels for three to five transfers. Their results supported theoretical predictions that only "soft" selection maintains polymorphism, highlighting the importance of experimental studies to understand maintenance of variation in nature.
Related Concept Videos
Carbohydrate Digestion
What is Monogastric Digestion?
Lipid Digestion
Protein Digestion
What is Natural Selection?
Conservation of Small Populations

