Which is the most common mechanism of genetic variation in the population of a sexually reproducing organism?

(1) Transduction

(2) Chromosomal aberrations

(3) Genetic drift

(4) Recombination

Subtopic:  Sources of Variation: 1 | Sources of Variation: 2 | Sources of Variation |
 66%
NEET - 2015
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What is common to whale, seal and shark?

(1) Seasonal migration

(2) Thick subcutaneous fat

(3) Convergent evolution

(4) Homeothermy

Subtopic:  Definition & Types of Evolution |
 55%
NEET - 2007
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Artificial selection to obtain cows yielding high milk output represents

1. Stabilising selection as it stabilizes this character in the population
2. Directional as it pushes the mean of the character in one direction
3. Disruptive as it spills the population into two, one yielding higher output and the other lower output
4. Stabilizing followed by disruptive as it stabilizes the population of producing higher yielding cows
Subtopic:  Additional Theories of Darwin |
 57%
NEET - 2017
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In Hardy- Weinberg equation, the frequency of heterozygous individual is represented by

(1) P2

(2) 2pq

(3) pq

(4) q2

Subtopic:  Hardy Weinberg Law: 1 | Hardy Weinberg Law |
 88%
From NCERT
NEET - 2016
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Which of the following is the correct sequence of events in the origin of life?

I.    Formation of protobionts,

II.   Synthesis of organic monomers.

III.  Synthesis of organic polymers.

IV.   Formation of DNA-based genetic systems.

 

(1) I,II,III,IV

(2) I,III,II,IV

(3) II,III,I,IV

(4) II,III,IV,I 

Subtopic:  Origin of Life: Chemical Evolution: 1 | Origin of Life |
NEET - 2016
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Analogous structures are a result of
(1) Convergent evolution 

(2) shared ancestry

(3) stabilising selection 

(4) divergent evolution

Subtopic:  Concept of Organic Evolution: Evidence: 1 | Concept of Organic Evolution: Evidence |
 90%
From NCERT
NEET - 2016
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Which of the following structures is homologous to the wing of a bird?

(1) Wing of a moth

(2) Hind limb of rabbit

(3) Flipper of whale

(4) Dorsal fin of a shark

Subtopic:  Concept of Organic Evolution: Evidence: 1 | Concept of Organic Evolution: Evidence |
 54%
NEET - 2016
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Following are the two statements regarding the origin of life

I.  The earliest organisms that appeared on the earth were non-green presumably

anaerobes.

II. The first autotrophic organisms were the chemoautotrophs that never released

oxygen.

Of the above statements which one of the following options is correct?

1. II is correct but I is false

2. Both I and II are correct

3. Both I and II are false

4. I is correct but II is false 

Subtopic:  Origin of Life: Chemical Evolution: 1 | Origin of Life |
 67%
NEET - 2016
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The wings of a bird and the wings of an insect are

1. homologous structures and represent divergent evolution

2. analogous structures and represent convergent evolution

3. phylogenetic structures and represent divergent evolution

4. homologous structures and represent convergent evolution

Subtopic:  Concept of Organic Evolution: Evidence: 2 | Concept of Organic Evolution: Evidence |
 86%
From NCERT
NEET - 2015
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Which of the following are most suitable indicators of SO2 pollution in the environment?

1. Lichens

2. Conifers

3. Algae

4. Fungi

Subtopic:  Natural Selection |
 94%
From NCERT
NEET - 2015
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