Q. No.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
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
In Britain, with the passage of clean air legislation, the frequency of melanic forms of the peppered moth decreased dramatically. This is called :
| 1. | saltatory evolution | 2. | retrograde evolution |
| 3. | reverse evolution | 4. | Antievolution |
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 persistence of different genotypes in a population through heterozygote superiority is an example of:
| 1. | mutation | 2. | parallel evolution |
| 3. | polymorphism | 4. | adaptive radiation |
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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Bryophytes evolved from:
1. Chlorophyte ancestors
2. Tracheophyte ancestors
3. Rhynia-type plants
4. Psilophytons
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In allopatric speciation, reproductive isolation is initially caused by:
| 1. | behavioral barriers | 2. | postzygotic barriers |
| 3. | geographic barriers | 4. | ecological barriers |
Persons with sickle cell trait are resistant to severe malaria. This shows:
1. heterozygote advantage
2. heterosis
3. punctuated equilibrium
4. reverse evolution
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The most critical evolutionary process, that leads to changes in allele frequencies and favors or promotes adaptation as a product of evolution, is :
| 1. | Genetic drift | 2. | Gene migration |
| 3. | Mutation | 4. | Natural selection |
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