Genetic repatterning during isolation, Biology

Assignment Help:

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.


Related Discussions:- Genetic repatterning during isolation

Define role of iron in controlling gene expression, Define Role of Iron in ...

Define Role of Iron in Controlling Gene Expression? Iron metabolism is regulated by a complex co-ordinate mechanism. Recent evidence supports specific past-transcriptional mech

Newton, meaning of the law of inertia

meaning of the law of inertia

How are fishes characterized, Q. Fish identity card. How are fishes charact...

Q. Fish identity card. How are fishes characterized according to examples of representing beings, skin, basic morphology, circulation, nitrogen waste, respiration, thermal control

Discuss about the luria nebraska procedure, Discuss about the Luria Nebrask...

Discuss about the Luria Nebraska procedure The Luria Nebraska procedure involves an age and education correction. It is accomplished by computation of a cutoff score for abnorm

The oxidative phase generates nadph, 1)  The oxidative phase  generates N...

1)  The oxidative phase  generates NADPH The oxidative branch of  the pathway  generates NADPH  and pentose-5-phosphate, through the following  reactions: a)  Glucose-6-pho

Diverse proteins made by the same total number of amino acid, Q. Are there ...

Q. Are there diverse proteins made by the same total number of amino acids? Diverse proteins with the same total number of amino acids may exist. In such cases the discriminati

Biology, how can i get an demo assignment to solve?

how can i get an demo assignment to solve?

What is single s2, What is Single S 2 In cyanotic TOF, S, consists enti...

What is Single S 2 In cyanotic TOF, S, consists entirely of A, as P, is attenuated by a deformed pulmonary valve when there is valvar steuosis and aorta is placed anteriorly re

.Botany, 57. While planning for an artificial hybridisation programme invol...

57. While planning for an artificial hybridisation programme involving dioecious plants, which of the following steps will be irrelevant A usting of pollen on stigma B Collection

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd