Question

describe briefly four ways in which iduvidual with particular trait may increase in population

Answer 1

(i) Natural selection: Those variations which give survival advantage to an organism are selected in nature and such traits increase in population.

(ii) Genetic drift: It occurs due to change in gene frequency due to accumulation of particular type of genes.

(iii) Geographical isolation: It leads to change in gene frequency leading to expression of one type of traits in a geographically isolated population.

(iv) Migration: It leads to flow of a particular type of gene in a specified population.

Answer 2

The following are the four ways in which individuals with a particular trait may increase in population- 
1) Natural Selection- of variations brought through the course of time. 
2)Mutation- Slight changes in the genetic information of the offspring during fertilization. 
3)Geographic Isolation- where a population of species gets separated by their respective group due to physical/natural barriers. 
4)Genetic Drift and Isolation- An accident in small population of a species may also result in survival of species having a particular trait.