Evolution & Genetics.

Reverse an environment and watch an inherited advantage change direction.

Sample a tiny population one generation at a time and watch neutral alleles wander.

Keep the same allele frequency while changing the genotype mix.

Explore why selection need not erase a deleterious recessive allele.

Tune how strongly two species compete for the same limited resources.

Classify five helping acts using relatedness, reproductive benefit and cost.

Make rarity advantageous or disadvantageous and track a type’s changing frequency.