describe any three ways in which individuals with a particular trait may increase in population?
GENETIC DRIFT:-When the frequency of some genes gets changed in a small population due to some accidental reasons, such phenomenon is known as Genetic Drift. Genetic drift can give rise to different changes in sub-populations. It is random and rarely produces adaptations to the environment.
NATURAL SELECTION:- It may be defined as a process that results in the increased
survival and reproductive success of individuals, who are well adjusted to the
environment. Theory of natural selection was given by Charles Robert Darwin
The effect of geographic isolation is that the two populations are subjected to different selection pressures, since the conditions in the two areas will be different. So different alleles will be selected for, and genetic differences will gradually accumulate between, the populations.
In time, enough genetic differences will occur so that the two populations will no longer interbreed. Then, by definition, they have become different species.
1 natural selection : some variations are selected by nature these provide survival advantage
2 genetic drift : accidents in small populations can change frequencies of some genes , they dont provide survival advantage ...
3 specaition : if a population splits into two sub populations then these two sub populations cannot reproduce with each other ..
hope u got it
genetic drift ;It refers to the random change in the the frequency of alleles in a population over successsive generation due to sampling errors in gametes
over generation the genetic drift will accumulate different changes in the sub population.
accidental death of a population can also lead to the rise in population of another species with particular trait.
->population with special trait may withstand the attack of predators and multiply.this can be termed as natural selection.the unfit individuals get eliminate and the useful trait will survive and pass the variation to the progeny.
1.Natural selection - The variations which give survival advantage to an organism are selected in nature and such traits increase in population.
2.Genetic Drift - It occurs due to change in gene frequency due to accumulation of a particular type of trait.
3.Geographical Isolation- It leads to change in gene frequency leading to expression of one type of traits in a geographically isolated population.
4.Migration- It leads to flow of particular type of gene in a specified population.
Hope it helps you !
1. genetic drift : the change in frequency of the gene in the dna is known as genetic drift .
2. natural selection : survival of the fittest after competing and struggle for existence with other organisms in the environment is known as natural selection.
3. variation : error in dna copying during reproduction is known as variation.