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:  Hardy Weinberg Law |
 74%
NEET - 2015
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Variation in gene frequencies within populations can occur by chance rather than by natural selection. 
This is referred to as:

1. Genetic drift

2. Random mating

3. Genetic load

4. Genetic flow

Subtopic:  Hardy Weinberg Law |
 85%
From NCERT
AIPMT - 2013
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Darwin's finches are a good example of:

1. industrial melanism

2. connecting link

3. adaptive radiation

4. convergent evolution

Subtopic:  Concept of Organic Evolution: Evidence: 2 | Concept of Organic Evolution: Evidence |
 89%
From NCERT
AIPMT - 2010
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Given that the frequency of children homozygous for the recessive allele for cystic
fibrosis is about 0.0016. What is the frequency of heterozygotes in the population? [Cystic fibrosis is inherited as an autosomal recessive disorder].

1. 0.960

2. 0.077

3. 0.040

4. 0.923

Subtopic:  Hardy Weinberg Law |
 53%
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Peripatus is a connecting link between:

1. Ctenophora and Plantyhelminthes

2. Mollusca and Echinodermata

3. Annelida and Arthropoda

4. Coelenterata and Poriphera

Subtopic:  Palentological Evidences of Evolution |
 74%
AIPMT - 2009
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One of the important consequences of geographical isolation is:

1. no change in the isolated fauna

2. preventing speciation

3. speciation through reproductive isolation

4. random creation of new species

Subtopic:  Concept of Isolation | Concept of Speciation |
 67%
AIPMT - 2007
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Which one of the following pair of items correctly belongs to the category of organs mentioned against it?
1. Thorn of Bougainvillea and tendrils of Cucurbita – Analogous organs
2. Nictitating membrane and blind spot in the human eye – vestigial organs
3. Nephridia of the earthworm and Malpighian tubules of cockroach - Excretory organs
4. Wings of a honey bee and wings of crow - Homologous organs

Subtopic:  Definition & Types of Evolution | Theory of Evolution & Lamarckism |
 66%
From NCERT
AIPMT - 2008
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The finches of the Galapagos islands provide evidence in favour of:

1. special creation

2. evolution due to mutation

3. retrogressive evolution

4. biogeographical evolution

Subtopic:  Darwin's Theory | Summary of Darwin's Theory |
 84%
From NCERT
AIPMT - 2007
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Which one of the following is not a living fossil?

1. King crab

2. Sphenodon

3. Archaeopteryx

4. Peripatus

Subtopic:  Concept of Speciation | Genetic Basis of Adaptation |
 55%
AIPMT - 2006
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The most recent and direct pre-historic ancestor is:

1. Cro-magnon 

2. Neanderthal

3. Pre-neaderthal

4. None of these

Subtopic:  Introduction to Human Evolution | Evolution Prior to Ape Man |
 64%
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