Q. No.In the famous experiment by Louis Pasteur, the straight and long-necked flasks served :
1. as the experimental setup
2. as a control
3. as a cohort
4. no useful purpose
1. as the experimental setup
2. as a control
3. as a cohort
4. no useful purpose
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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
An allele that reduces the fitness of organisms is found to decrease very rapidly in a population. Most likely this allele is:
1. recently mutated
2. rare
3. dominant
4. recessive
The set of all genes, or genetic information, in a unit of evolution is called the :
1. genotype
2. polymorphism
3. multiple allelism
4. gene pool
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Persons with sickle cell trait are resistant to severe malaria. This shows:
1. heterozygote advantage
2. heterosis
3. punctuated equilibrium
4. reverse evolution
A small population experiences a sudden crash in size due to a natural calamity. The biggest threat to the population is:
1. loss of genetic variability
2. tendency towards assortative mating
3. reduced gene flow
4. Hardy - Weinberg disequilibrium
What exactly does the nature act upon when selecting an organism?
1. dominant alleles
2. recessive alleles
3. phenotype
4. combined genotype
Which of the following would be an example of a population that can show the potential for rapid speciation?
1. small in number but highly variable gene pool
2. large in number with large variations in the gene pool
3.sexual dimorphism amongst members
4.isolated inbred population
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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
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A mutation appears in a sub-population of organisms separated from the other group by in the same large geographical area. This mutation can spread to the other subgroup by:
1. induced muations
2. mutations in the gene pool of the other subgroup
3. mutation pressures
4. crossovers
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