Q. No.The change in the frequency of an existing gene variant in a population due to random sampling of organisms is known as:
1. Saltation 2. Adaptive radiation 3. Genetic drift 4. Gene flow
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All the following are true regarding Homo erectus except:
1. Fossils were discovered in Java
2. Lived around 2.5 mya
3. Had a brain capacity of about 900 cc
4. Probably ate meat
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A chemical experiment that simulated the conditions thought at the time to be present on the early Earth and tested the chemical origin of life under those conditions was performed by:
| 1. | Georges Cuvier | 2. | Francesco Redi |
| 3. | Alfred Russell Wallace | 4. | Stanley Miller |
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The wings of bats and birds are:
| 1. | convergent functionally but not anatomically |
| 2. | convergent both functionally and anatomically |
| 3. | convergent neither functionally nor anatomically |
| 4. | divergent functionally and anatomically |
Allele and genotype frequencies in a population will remain constant from generation to generation in the absence of all the following evolutionary influences, except:
| 1. | Random mating | 2. | Mutations |
| 3. | Natural selection | 4. | Gene flow |
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Speciation that occurs when biological populations of the same species become isolated from each other to an extent that prevents or interferes with gene flow is called as:
| 1. | parapatric speciation | 2. | cladogenesis |
| 3. | allopatric speciation | 4. | anagenesis |
Biochemical evidence for evolution assumes that the more recently two species shared a common ancestor, the more alike their:
| I: | stained chromosome bands. |
| II: | DNA sequences. |
| III: | protein sequences. |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II, and III |
What causes the ‘struggle for existence?
| 1. | overproduction and imbalance with available resources |
| 2. | innate competitive tendencies |
| 3. | the decrease in the environmental carrying capacity |
| 4. | territories and dominance hierarchies |
Which of the following is not a finding observed by Darwin, when he landed on the Galapagos Islands?
| 1. | Woodpeckers were absent on the islands |
| 2. | The island species resembled the mainland species |
| 3. | Islands contain more different species of finches than the mainland |
| 4. | The corresponding size of the species was smaller on the islands than the species on the mainland |
According to the Darwinian concept of evolution, a giraffe has a long neck because:
| 1. | it was always like that since the beginning |
| 2. | during evolution the number of cervical vertebrae got increased |
| 3. | its ancestors stretched their necks to get food |
| 4. | ancestral giraffes with longer necks got more food and left more surviving offspring |
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