Question:

In which condition, the gene ratio remains constant for any species :-

Updated On: Mar 26, 2024

Sexual selection
Random mating
Mutation
Gene flow

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The Correct Option is B

Solution and Explanation

Allele frequency in a population can remain constant only if individuals of the population randomly interbreed. Generally it never happens in nature and species populations exist in small groups of randomly breeding subpopulations. Thus allele frequency between two subpopulations may differ but allele frequency within the subpopulation will remain constant. Such subpopulations are termed Mendelian populations or deme. Exchange of genes between demes takes place occasionally. Mutation, gene flow (due to migration), etc. may tend to change the allele frequency of the subpopulation.

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List I		List II
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(Take \(\frac{1}{4\pi\epsilon_0}=9\times10^9\) SI units)
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Concepts Used:

Evolution

Evolution is a process that occurs in changes in the genetic content of a population over time. Evolutionary change is generally classified into two: microevolution and macroevolution. The process of changes in allele frequencies in a population over time is a microevolutionary process. Three main mechanisms that cause allele frequency change are natural selection, genetic drift, and gene flow. On the other hand, macroevolution refers to change at or above the level of the species.

List - I		List – II
A.	Living Fossil	i.	Elongated canine teeth
B.	Connecting Link	ii.	Vermiform appendix
C.	Vestigial Organ	iii.	Echidna
D.	Atavism	iv.	Latimeria