A bottleneck event is a specific example of a situation in which a reduction in population size results in evolutionary change to a population. This simulation examines the impact of a drought on a population of organisms. Each time the simulation is run, 4 random individuals survive the drought. Run the simulation multiple times to discover how the results can vary.

Color is determined by a single gene with two alleles; red and blue. Heterozygotes are purple.

Red (Genotype: RR)

Purple (Genotype: RB)

Blue (Genotype: BB)