Mardi Gras-a carnival held in some countries on Shrove Tuesday (the last day before Lent) but especially in New Orleans.
Bottleneck effect is when there's something that either kills the majority of the population or just prevents it from reproducing. This creates genetic drift because the likelihood of gene prominence changing is much higher in a small population. The Founder Effect is a type of Bottleneck effect. It is when a small amount of individuals starts a population usually due to migration.
In the study of genetics, a population bottleneck is an event in which the gene pool of an existing population of organisms experiences a drastic reduction of diversity, and a change in the distribution of alleles.Various mechanisms can lead to a population bottleneck.edit] Founder effect. The founder effect is a special case of a bottleneck, where a small subset of a population founds a new population, having migrated to a new area, e.g. an island on the coast. The key features of this particular variety of bottleneck are the new location and that the original population survives.