Allopatric speciation
A. New species evolve when one (or) more population of a species becomes separated from the other population of the species due to geographical barrier
B. Small groups of individuals break off from the larger group and form a new species
C. Over the time, cessation of the gene flow between geographically isolated population leads to the reproductive isolation
D. The initial stage of allopatric speciation is polymorphism that does not depend on space within a population
E. As a result of natural selection, geographically separate population become adapted to local conditions and thus they are genetically differentiated
Choose the correct answer from the options given below:
1. A and E only
2. A, E, and C only
3. A, B, and D only
4. A , B, C and E
Subtopic: Â Concept of Speciation |
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Even harmful mutations do not get eliminated from the gene pool due to
1. Genetic drift
2. Higher frequency due to dominant nature
3. Being recessive and persisting in heterozygous condition
4. Survival value
1. Genetic drift
2. Higher frequency due to dominant nature
3. Being recessive and persisting in heterozygous condition
4. Survival value
Subtopic: Â Hardy Weinberg Law |
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Given below are two statements
Statement I : In sympatric speciation, gene flow is reduced by polyploidy, sexual selection and habitat differentiation
Statement II: Hybrid zones, which produce offspring of mixed ancestry, are the predicted outcome when species with incomplete reproductive barrier come into contact with one another.
In light of the above statements, choose the most appropriate answer from the options given below
1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct
Statement I : In sympatric speciation, gene flow is reduced by polyploidy, sexual selection and habitat differentiation
Statement II: Hybrid zones, which produce offspring of mixed ancestry, are the predicted outcome when species with incomplete reproductive barrier come into contact with one another.
In light of the above statements, choose the most appropriate answer from the options given below
1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct
Subtopic: Â Concept of Speciation |
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What will happen to the population of two forms of Biston betularia (peppered moth) inhabiting the region polluted due to emission of soot from industries?
A. Population of dark colored moth will increase
B. Population of both the forms will decrease
C. Population of light colored moth will increase
D. Population of dark colored moth will increase while the population of light colored moth will decrease
E. Population of both the forms will increase
Choose the correct answer from the options given below:
1. A and D only
2. C, D, and E only
3. C and D only
4. B, C, and D only
A. Population of dark colored moth will increase
B. Population of both the forms will decrease
C. Population of light colored moth will increase
D. Population of dark colored moth will increase while the population of light colored moth will decrease
E. Population of both the forms will increase
Choose the correct answer from the options given below:
1. A and D only
2. C, D, and E only
3. C and D only
4. B, C, and D only
Subtopic: Â Natural Selection |
 91%
From NCERT
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Genetic drift operates in
1. Small isolated population
2. Fast reproductive population
3. Large isolated population
4. Slow reproductive population
1. Small isolated population
2. Fast reproductive population
3. Large isolated population
4. Slow reproductive population
Subtopic: Â Difference Between Drift & Selection |
 83%
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At a particular locus, frequency of "A" allele is 0.6 and that of "a" is 0.4. What would be the frequency of heterozygotes in a random mating population at equilibrium?
1. 0.36
2. 0.16
3. 0.24
4. 0.48
1. 0.36
2. 0.16
3. 0.24
4. 0.48
Subtopic: Â Hardy Weinberg Law |
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The eye of octopus and eye of dog show different structural patterns, yet they perform similar functions. This is an example of
1. Analogous organs that have evolved due to divergent evolution
2. Homologous organs that have evolved due to convergent evolution
3. Homologous organs that have evolved due to adaptive radiation
4. Analogous organs that have evolved due to convergent evolution
1. Analogous organs that have evolved due to divergent evolution
2. Homologous organs that have evolved due to convergent evolution
3. Homologous organs that have evolved due to adaptive radiation
4. Analogous organs that have evolved due to convergent evolution
Subtopic: Â Concept of Organic Evolution: Evidence |
 89%
From NCERT
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Which one of the following combination is correct in relation to 'natural selection'?
A. Individuals with inherited traits that are best suited to the local environment
B. Over many generations, a higher proportion of individuals in a population will have the advantageous traits
C. Individuals in a population vary in their traits
D. Competition is inevitable
E. Evolution occurs as the unequal reproductive success of individuals adapt the population to its environment
Choose the correct answer from the options given below:
1. B, C and D only
2. A, B, C and D only
3. C, D and E only
4. A, B, C, D and E only
A. Individuals with inherited traits that are best suited to the local environment
B. Over many generations, a higher proportion of individuals in a population will have the advantageous traits
C. Individuals in a population vary in their traits
D. Competition is inevitable
E. Evolution occurs as the unequal reproductive success of individuals adapt the population to its environment
Choose the correct answer from the options given below:
1. B, C and D only
2. A, B, C and D only
3. C, D and E only
4. A, B, C, D and E only
Subtopic: Â Theory of Evolution & Lamarckism |Â Darwin's Theory |Â Summary of Darwin's Theory |
 57%
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Which of the following are incorrect about natural selection?
A. It is a process in which individuals with certain heritable traits survive and reproduce at a higher rate than do other individuals
B. It is a process that occurs through interactions between individuals and their enviornment resulting in the evolution of individuals
C. It is a process that can over time, increase the frequency of favourable adaptations in a given enviornment
D. It is a process that disropts the adaptation of individuals to a new environment
E. Natural selection may lead to speciation
Choose the correct answer from the options given below
1. A and B only
2. B and D only
3. D and E only
4. C and E only
A. It is a process in which individuals with certain heritable traits survive and reproduce at a higher rate than do other individuals
B. It is a process that occurs through interactions between individuals and their enviornment resulting in the evolution of individuals
C. It is a process that can over time, increase the frequency of favourable adaptations in a given enviornment
D. It is a process that disropts the adaptation of individuals to a new environment
E. Natural selection may lead to speciation
Choose the correct answer from the options given below
1. A and B only
2. B and D only
3. D and E only
4. C and E only
Subtopic: Â Darwin's Theory |
From NCERT
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Terrestrial life evolved from aquatic life due to
1. Development of extra-embryonic membranes
2. Development of glandular skin
3. Modification of appendages into limbs
4, High body temperature
1. Development of extra-embryonic membranes
2. Development of glandular skin
3. Modification of appendages into limbs
4, High body temperature
Subtopic: Â Origin of Life |
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