Q. No.
Which of the following statements about fossil evidence for evolution is correct?
| 1. | Fossil evidence shows a sudden and complete appearance of modern species without transitional forms. |
| 2. | Fossils of transitional forms, such as Archaeopteryx, demonstrate the evolutionary link between reptiles and birds. |
| 3. | The fossil record is complete and provides evidence for every stage of evolution in all organisms. |
| 4. | Fossils primarily show that extinct species were entirely unrelated to modern species. |
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 |
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
Bryophytes evolved from:
1. Chlorophyte ancestors
2. Tracheophyte ancestors
3. Rhynia-type plants
4. Psilophytons
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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