Genetic drift occurs when a few individuals of a species colonize an island. This phenomenon is :

(1) the bottleneck effect

(2) the founder effect

(3) assortative mating

(4) random mating 

Subtopic:  Difference Between Drift & Selection |
 76%
From NCERT
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh

The unit of evolution is now known to be the:
1. individual
2. family
3. population
4. species

Subtopic:   A BRIEF ACCOUNT OF EVOLUTION |
 56%
Please attempt this question first.
Hints

The struggle for existence is a consequence of:

(1) Each organism leaving more organisms than needed to replace itself

(2) Innate competitive tendencies

(3) The inevitable difficulty of coping with climatic conditions

(4) Territories and dominance hierarchies

Subtopic:  Darwin's Theory |
 52%
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints

Darwin believed that a giraffe has a long neck because:

1. a creator designed it that way

2. catastrophes eliminated short neck forms

3. its ancestors stretched their necks to get food

4. ancestral giraffes with longer necks got more food and left more surviving off-springs.

Subtopic:  Summary of Darwin's Theory |
 64%
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh

In a sympatric speciation, there is:

1. geographical isolation between groups of population
2. no geographical isolation between groups of population
3. reproductive isolation of a subpopulation in the midst of the parent population 
4. geographical isolation bout no reproductive isolation
Subtopic:  Concept of Speciation |
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints

In modern terms, selection refers to :

1. Inheritance of dominant characters
2. differential reproduction 
3. a decrease in allele frequency in a population
4. differences in the contribution of various genotypes to the next generation 

Subtopic:  Summary of Darwin's Theory |
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints

In genetic drift, the term "genetic bottleneck" means:

1. reduction in allele frequencies or richness

2. random change in allele frequency by chance alone

3. sudden increase in the number of individuals

4. reproductive isolation of the population

Subtopic:  Sources of Variation: 2 | Sources of Variation |
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints

De Vries based his "Mutation Theory" on his observation on:

(1) Pisum sativum

(2) Drosophila melanogaster

(3) Oenothera lamarckiana

(4) Caenorhabditis elegans

Subtopic:  Hugo De Vries Theory of Evolution |
 90%
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints

Which of the following is not a major evolutionary trend seen in the evolution of horse?

(1) Progressive increase in the number of toes

(2) Increase in the complexity of the molar teeth

(3) Lengthening of the limbs in general

(4) Enlargement of the brain

Subtopic:  Palentological Evidences of Evolution |
 51%
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints

Identify the correct statement:

1. As the coacervates do not have lipid outer membranes and cannot reproduce, they alone could not have been the precursors of life.

2. The microspheres could not be induced to constrict but had no large amount of diversity

3. The earliest life was probably not driven by the solar energy as is seen today

4. Protobionts cannot separate combination of molecules from the surroundings or maintain an internal environment but are able to reproduce.

Subtopic:  Origin of Life: Chemical Evolution: 2 | Origin of Life |
To view explanation, please take trial in the course.
NEET 2021 - Achiever Batch - Aryan Raj Singh
Hints