............... operates to eliminate intermediate phenotypes.

(1) Directional selection

(2) Disruptive selection

(3) Stabilizing selection

(4) Random chance

Subtopic:  Natural Selection |
 62%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

Many bacteria are now resistant to penicillin, because:

(1) penicillin causes gene mutations, some of which are beneficial

(2) previously resistant forms survived and reproduced better than non-resistant forms

(3) the hospital environment inhibits competition among bacteria

(4) penicillin triggers the synthesis of resistant proteins

Subtopic:  Sources of Variation: 1 | Sources of Variation |
 73%
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A change in allele frequency within a population, over a succession of generations, is called:

(1) microevolution, or adaptive evolution

(2) macroevolution, or speciation

(3) coevolution

(4) phylogenetic evolution

Subtopic:  Hardy Weinberg Law: 1 | Hardy Weinberg Law: 2 | Hardy Weinberg Law |
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A plant population that reproduces by self - pollination is an extreme example of :

(1) the bottleneck effect

(2) the founder effect

(3) rapid gene flow

(4) assortative mating

Subtopic:  Sources of Variation: 1 | Sources of Variation: 2 | Sources of Variation |
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People who carry an allele for normal hemoglobin and an allele for sickle cell are resistant to malaria. They are examples of:

1. heteozygote advantage

2. extreme diploidy

3. outbreeding

4. recessive superiority

Subtopic:  Natural Selection |
 70%
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A deleterious allele decreases more rapidly in frequency if it is:

(1) recently mutated

(2) rare

(3) dominant

(4) Recessive

Subtopic:  Natural Selection |
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In a population of red (dominant) and white flowers, the frequency of red flowers is 91 %. What is the frequency of the red allele?

(1) 9 %

(2) 30 %

(3) 91 %

(4) 70 %

Subtopic:  Hardy Weinberg Law: 1 | Hardy Weinberg Law: 2 | Hardy Weinberg Law |
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The earliest known members of the horse family belong to the genus:

1. Hyracotherium                                                             

2. Equus

3. Mesohippus                                                                  

4. Merychippus

Subtopic:  Palentological Evidences of Evolution |
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What is the half life of U238, the radioactive isotope of uranium?

(1) 4500 years

(2) 4.5 million years

(3) 45 million years

(4) 4.6 billion years

Subtopic:  Palentological Evidences of Evolution |
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A population of an animal is hunted down to only 20 organisms. Later the number is restored to 10,000 organisms, but the variations in this population are highly reduced. This is called:

1. Founder Effect

2. Bottleneck effect

3. Edge effect

4. Heterosis

Subtopic:  Sources of Variation: 2 | Sources of Variation |
 61%
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