Genetic repatterning during isolation, Biology

An island may be colonised by just a few individuals, or just a pair:, or even a single gravid female. When a new population develops from these early colonisers of the island, they undergo drastic genetic repatterning. This is sonletirnes described as a genetic revolution. The founder being small in number, the first major change in the colonisers is a drastic reduction in the variability. Inbreeding further reduces variability. Inbreeding eliminates recessives as homozygotes and the genetic load is reduced. The decisive change is from a large open population to a small closed population. In the closed population, overdominance, that is the superior fitness of the heterozygote (say, Aa) over the other two homozygotes (AA and aa), increases. Non-allelic epistatic interactions of genes greatly alter the functioning of the gene complexes. As a result the genetic cohesiveness is broken and the founder population becomes plastic and pliable enough to be moulded into a newer one with better adaptations. This, in essence, is the genetic repatterning or the genetic revolution.

Posted Date: 4/5/2013 5:36:11 AM | Location : United States







Related Discussions:- Genetic repatterning during isolation, Assignment Help, Ask Question on Genetic repatterning during isolation, Get Answer, Expert's Help, Genetic repatterning during isolation Discussions

Write discussion on Genetic repatterning during isolation
Your posts are moderated
Related Questions
Q. What are biopolymers? Polymers are macromolecules made by the union of several smaller identical molecules, called monomers. Biopolymers are polymers present in the living b

There are two distinct methods through that cells synthesize ATP.  In  oxidative phosphorylation which containing  the electron transport  chain and the generation  of ATP is linke

Which is the extraembryonic membrane whose function is to store nitrogen wastes of the embryo? Is this function present in placental mammalian embryos? The allantois is the ext

While waiting at an airport , nail Campbell once overheard this claim, its paranoid and ignorant to worry about industry or agriculture contaminating the environment with chemical

Illustrate metabolic processes of vitamin B In the human and animal metabolism, they form a functional unit, since, as components of the various coenzymes, they are essential

Explain changes in gastrointestinal tract of infants? A full term baby has the ability to digest simple proteins, carbohydrates and emulsified fats. In first 3-4 months, the p

Feline calcivirus infection This disease is caused by a virus under the family Caliciviridae. Its symptoms  include rhinitis, tracheitis and pneumonia. The animals are lethargi


Relative to carrying capacity, what may result from unbridled continued growth of our population.

What is Satisfactory health The implants shows history of or potential for problems though they exhibit health. The features or clinical conditions which are representative of