Answer: Mutation
Natural selection will only cause evolution if there is enough genetic variation in a population. Before the discovery of Mendelian genetics one common hypothesis was blending inheritance. But with blending inheritance genetic variance would be rapidly lost making …
Genetic drift – Wikipedia
Genetic variation – Wikipedia
Wed Aug 14 2002 14:30:00 GMT-0400 (Eastern Daylight Time) · Genetic drift (also known as allelic drift or the Sewall Wright effect) is the change in the frequency of an existing gene variant in a population due to random sampling of organisms. The alleles in the offspring are a sample of those in the parents and chance has a role in determining whether a given individual survives and reproduces. A population s allele frequency is the fraction of the …
Tue Oct 07 2008 14:30:00 GMT-0400 (Eastern Daylight Time) · Fixed alleles were first defined by Motoo Kimura in 1962. He discussed how fixed alleles could arise within populations and was the first to generalize the topic. He credits the works of Haldane in 1927 and Fisher in 1922 as being important in providing foundational information that allowed him to come to his conclusion. Kimura’s later works were pivotal in the foundation of evolutionary and …
Immigration may add new genetic material to the established gene pool of a population. Conversely emigration may remove genetic material. Conversely emigration may remove genetic material. As barriers to reproduction between two diverging populations are required for the populations to become new species gene flow may slow this process by spreading genetic differences between the …
Human evolutionary genetics studies how one human genome differs from another human genome the evolutionary past that gave rise to the human genome and its curr…