Class 12 Biology · Chapter 12 · Test 1
Evolution and Darwinism
40 MCQs
40 questions · 35 min · 40 marks
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Sample questions
The first 5 of 40. Try each one, then tap to see the answer.
Question 1
Who developed a theory of natural selection essentially identical to Darwin's?
- AHardy-Weinberg
- BAlfred Wallace
- CMalthus
- DLyell
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Answer: B
Alfred R. Wallace proposed a mechanism of evolution very similar to Darwin's and wrote to him about it.
Question 2
According to the theory of natural selection, variations arise due to:
- AMutations
- BUse and disuse of organs
- CSelective breeding
- DSplitting of population
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Answer: A
Genetic variations arise by random mutations.
Question 3
Which condition is NOT required for Hardy-Weinberg equilibrium?
- ARandom mating
- BNo mutation
- CNatural selection
- DLarge population size
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Answer: C
All genotypes must have an equal chance of survival so natural selection must be absent.
Question 4
Genetic drift is the change in gene frequency due to:
- AChance events
- BNatural selection
- CEmigration of individuals
- DImmigration of individuals
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Answer: A
Genetic drift results from chance events and not from fitness.
Question 5
If a massive fire kills 90% of a population and survivors remain by luck such a change in allelic frequency will be called:
- ANatural selection
- BGenetic drift
- CGene flow
- DMutation
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Answer: B
Chance reduction of a population changes allele frequencies by genetic drift.
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