- 1(current)
Q. No.The idea of mutations was brought forth by
| 1. | Hugo de Vries, who worked on evening primrose |
| 2. | Gregor Mendel, who worked on Pisum sativum |
| 3. | Hardy Weinberg, who worked on allele frequencies in a population |
| 4. | Charles Darwin, who observed a wide variety of organisms during sea voyage |
Subtopic: Hugo De Vries Theory of Evolution |
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Which of the following correctly describes the difference between Darwin’s theory of evolution and Hugo de Vries’ theory of mutation?
| 1. | Darwin's theory suggests gradual accumulation of small variations, while de Vries' theory suggests that mutations cause large, sudden changes. |
| 2. | Darwin's theory implies mutations are random, while de Vries believed in directional variation through mutation. |
| 3. | Both Darwin and de Vries believed that mutations were the primary cause of evolution. |
| 4. | Darwin and de Vries both emphasized that minor, heritable variations led to speciation. |
Subtopic: Hugo De Vries Theory of Evolution |
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Which of the following statements is incorrect with respect to evolution?
| 1. | Mutations are random and directionless |
| 2. | According to Darwin, variations are small and directional and evolution is gradual |
| 3. | Saltation is single step large mutation which causes speciation |
| 4. | Evolution according to de Vries was gradual while Darwin believed mutations caused speciation |
Subtopic: Darwin's Theory | Hugo De Vries Theory of Evolution |
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Read the following paragraph with blanks A, B, C, and D.
Hugo de Vries based his work on A brought forth the idea of mutations. Mutations are random and B while Darwinian variations are small and C . Evolution for Darwin was gradual while de Vries believed mutation caused speciation and hence called it D.
Choose the option which correctly fills in the blanks A, B, C, and D.
| A | B | C | D | |
| 1. | Evening primrose | Directional | Directionless | Saltation |
| 2. | Evening primrose | Directional | Directionless | Natural selection |
| 3. | Garden pea | Directionless | Directional | Saltation |
| 4. | Evening primrose | Directionless | Directional | Saltation |
Subtopic: Hugo De Vries Theory of Evolution |
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Variations during mutations of meiotic recombinations are
1. random and directionless
2. random and directional
3. random and small
4. random, small and directional
Subtopic: Hugo De Vries Theory of Evolution |
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