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Genetic Drift

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Question

Read the following statements and select the correct option.
A. Increase in melanised moths after industrialisation in Great Britain is a proof for natural selection.
B. When more individuals of a population acquire a mean character value, it is called disruption.
C. Changes in allelic frequency in a population will lead to Hardy-weinberg equilibrium.
D. Genetic drift changes the existing gene or allelic frequency in future generations.

A

B alone is correct.

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B

D alone is correct.

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C

A and D alone are correct.

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D

B and D alone are correct.

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Solution

The correct option is A B alone is correct.
In this case, the variance of the trait increases and the population is divided into two distinct groups. In this more individuals acquire peripheral character value at both ends of the distribution curve.
So, the correct option is 'B alone is correct.'.

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Q. Read the following statements and select the correct option.
(i) Increase in melanised moths after industrialisation in Great Britain is a proof for natural selection.
(ii) When more individuals of a population acquire a mean character value, it is called disruption
(iii) Changes in allelic frequency in a population will lead to Hardy-Weinberg equilibrium.
(iv) Genetic drift changes the existing gene or allelic frequency in future generations.

Q. Read the statements (i-iv) and choose the correct option:
i. Increase in melanized moths after industrialization in Great Britain is a proof of Natural Selection.
ii. More individuals acquiring mean character value cause disruption.
iii. Change in allelic frequency leads to Hardy-Weinberg equilibrium.
iv. Genetic drift changes allelic frequency in future generations.

Q. Read the following statements and select the correct option.

I. When certain individuals migrate out of the population, gene frequencies change in the population.

II. Stabilising, directional and disruptive selection are types of artificial selection.

III. Extreme phenotypes are favoured in the disruptive selection.

IV. Single step large mutation is called genetic drift.

Q. Hardy-Weinberg equation helps in finding:
(I) Frequency of recessive allele responsible for X-linked recessive disease in a population
(II) Frequency of occurrence of alleles of a gene in a population
(III) Frequency of mutant gene in a population
(IV) Frequency of heterozygotes in a population

Choose the correct option.

Q. Read the following statements
I) Directional selection occurs when natural selection favours one extreme of continuous variation.
II)Disruptive selection occurs when natural selection favours both extremes of continuous variation.
III) In directional selection, a population's genetic variance shifts toward a new phenotype when exposed to environmental changes.
IV)Random changes in gene frequencies due to chance in large population is called genetic drift.
True statements are

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