Video Link: https://www.youtube.com/watch?v=flDT-TNY3G0

Founder effect
For more information, log on to- shomusbiology.weebly.com Download the study materials here- shomusbiology.weebly.com This video discusses the mechanism of founder effect which is an example of genetic drift. In population genetics, the founder effect is the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population. It was first fully outlined by Ernst Mayr in 1942,[1] using existing theoretical work by those such as Sewall Wright.[2] As a result of the loss of genetic variation, the new population may be distinctively different, both genetically and phenotypically, from the parent population from which it is derived. In extreme cases, the founder effect is thought to lead to the speciation and subsequent evolution of new species. In the figure shown, the original population has nearly equal numbers of blue and red individuals. The three smaller founder populations show that one or the other color may predominate (founder effect), due to random sampling of the original population. A population bottleneck may also cause a founder effect even though it is not strictly a new population. The founder effect is a special case of genetic drift.[3][4] In addition to founder effects, the new population is often a very small population and so shows increased sensitivity to genetic drift, an increase in inbreeding, and relatively low genetic variation. This can be observed in the limited gene pool of ...From:Suman BhattacharjeeViews:0 0ratingsTime:02:33More inEducation

Excerpt from:
Founder effect - Video

Comments are closed.