Directional selection favours:

(1) Both extremes of a trait

(2) Intermediate form of a trait

(3) Environmental differences

(4) One extreme form over the other extreme form and over intermediate forms of the trait

Subtopic:  Natural Selection |
 74%
From NCERT
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Most often the factor that initiates the speciation of two populations is:

(1) Geographic isolation

(2) Inability of the gametes to fuse

(3) Different courtship behaviours

(4) Different copulatory organs

Subtopic:  Concept of Speciation |
 82%
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The oldest fossils resemble:

1. Amoeba

2. Red algae

3. Heterotrophic bacteria

4. Autotrophic bacteria

Subtopic:  Palentological Evidences of Evolution |
 81%
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Reptilian ancestors of the mammals were the :-
1. Therapsids
2. Thecodonts
3. Pterosaurs
4. Plesiosaurs
 

Subtopic:   A BRIEF ACCOUNT OF EVOLUTION |
 76%
From NCERT
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Lamarck's theory of evolution is also called

1. Theory of special creation

2. Inheritance of acquired characters

3. Survival of the fittest

4. None of these

Subtopic:  Theory of Evolution & Lamarckism |
 87%
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Industrial melanism is an example of

(1) Neo Darwinism

(2) Natural selection

(3) Mutation

(4) Neo Lamarckism

Subtopic:  Natural Selection |
 88%
From NCERT
NEET - 2015
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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 |
 65%
NEET - 2015
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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 |
 56%
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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