Question

2) Sometimes when individuals of a species are translocated to a new habitat, the newly-founded population undergoes rapid evolutionary divergence (local adaptation), as the change in habitat variables drives selection. A) Is this an example of natural or sexual selection? B) Describe three hypothetical scenarios at the new habitat, one that would favor each kind of selection (directional, stabilizing, and disruptive). 8 points

Answer 1

A] This is an example for natural selection , because the individuals of a species are translocated to a different geographic location and they undergo adaptations to survive and reproduce offsprings. This is the exact concept what Natural Selection tends to tell.

Whereas in sexual selection one sex is developing characters predominant than the other sex of the same species.

B] DIRECTIONAL SELECTION:

The force where the population forwards towards the one end of the trait spectrum and makes them to evolve.

many traits are linked to many genes but some are linked to only one gene and most traits will continue as it . For example , lemurs with fur color white are more exposed to burns due to sun and causes less reproductive success the selection moves towards the dark coloured lemurs.

STABILIZING SELECTION:

when phenotypes of opposite sides have extreme phenotypes which are unfavourable causes stabilizing selection.It is an opposite of disruptive selection.It causes stabilizing of a population by making the intermediate trait most commonly expressed.

For example: plants tend to grow mostly in medium heights ,those who grow tall are in need of more energy and those can get damaged by wind meanwhile plants who grow short have limited sunlight and need to grow and expand.

DISRUPTIVE SELECTION:

It favours individual forms who have extreme form of trait over the individuals having intermediate forms.This can lead to formation of two different forms of populations of an organisms.

For example: moths in London is an example . moths in london had darker in colour and in rural areas were lighter in colour and there were some medium coloured moths left after the occurance of disruptive selection