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Genetic drift...

Genetic drift

A

Small isolated population

B

Large isolated population

C

Non-reproductive population

D

Slow reproductive population.

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The correct Answer is:
A
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Assertion: Genetic drift refers to changes in the allele frequency occuring by chance. Reason: Sampling errors often lead to the elimination of certain alleles and fixation of others, reducing genetic variability.

Assertion: Hardy-Weinberg principle explains the variations occurring in population and species over a number of generations. Reason: Hardy-Weinberg principle is applicable only when genetic drift occurs.

In a long term experiment of a population of Drosophila melnogaster, the frequency of two alleles 'a' and 'b' of a multi-allelic locus X over time has been shown in the following graph. 6 students were asked to evaluate the observed pattern and their inferences are given below. Statement 1: Enviorment is not uniformly slective. Statement 2: Population may be under artificial selection. Statement 3: Genetic variability is progressively reduced. Statement 4: Genetic varuability is progressively increased. Statement 5: Mechanism such as genetic drift is operating from time to time. Statement 6: Selection is favouring a particualr genotype through directional selection. The appropriate conclusions were draws by

Match column I with column II and select the correct option from the codes given below. {:("Column I","Column II"),("Mutation",(i)"Changes in population's frequencies due to chance alone"),("Gene flow",(ii)"Differences in survival and reproduction among variant individuals"),("Natural selection",(iii)"Immigration, emigration change allele frequencies"),("Genetic drift",(iv)"Source of new alleles"):}

Continential drift explains

Continential drift explains

What is drift velocity? Establish a relation between current and drift velocity?

The drift velocity of free electrons in a conductor is v, when a current i is flowing in it, Ifboth the radius and current are doubled, then the drift velocity will be :

A major side effect of continental drift was

Temperature dependence of drift velocity depends on the following factors.

AAKASH INSTITUTE ENGLISH-EVOLUTION-SECTION-C PREVIOUS YEARS QUESTIONS
  1. Artificial selection to obtain cows yielding higher milk output repres...

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  2. Genetic drift

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  3. In Hardy-Weinberg equation, the frequency of heterozygous individual i...

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  4. The chronological order of human evolution from early to the recent is...

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  5. Which of the following is the correct sequence of events in the origin...

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  6. A molecule that can act as a genetic material must fulfill the traits ...

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  7. Which of the following structures is homologus to the wing of a bird?

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  8. Analogous structures are a result of

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  9. Following are the two statements regarding the origin of life (a) ...

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  10. The wings of a bird and the wings of an insect are

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  11. Industrial melanism as found in peppered moth proves that

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  12. Which of the following had the smallest brain capacity

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  13. Which is the most common mechanism of genetic varisation in the poplul...

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  14. A population will not exist in Hardly-Weinberg equilbrium if

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  15. Forelimbs of cat, lizard used in walking , fore-limbs of whale used in...

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  16. Which one of the following are analogous structures?

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  17. The eye of octopus and eye of cat show different patterns of structure...

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  18. The process by which organims with different evolutionary history evol...

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  19. The tendency of population to remain in genetic equilibrium may be dis...

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  20. Variation in gene frequencies within populations can occur by chance r...

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