1 Dagobert II, 679; he was one of the last kings of the Merovingian line, murdered by persons unknown in the Ardennes Forest on December 23.  Giovanni Borgia, 2nd Duke of Gandia, 1497; his body was recovered in the Tiber with his throat slit and about nine stab wounds on his torso.
Bottlenecks and Founder Effects. Genetic drift can cause big losses of genetic variation for small populations. Population bottlenecks occur when a populations size is reduced for at least one generation.ottlenecks and Founder Effects. Genetic drift can cause big losses of genetic variation for small populations. Population bottlenecks occur when a populations size is reduced for at least one generation.
The random sampling style of genetic drift shrinks the gene pool and therefore alters the frequency the alleles are found in the population. Some alleles are completely lost within a generation due to genetic drift. This random change in the gene pool can affect the speed of evolution of a species. Instead of taking several generations to see a change in allele frequency, genetic drift can cause the same affect within a single generation or two.