- 1(current)
Q. No.Match each item in Column I with one item in Column II and chose your answer from the codes given below:
|
Column I |
Column II |
|
I. Sickle cell anemia II. Polyploidy III. Darwin finches IV. Tail in humans |
1. Sympatric speciation 2. Balancing selection 3. Adaptive radiation 4. Atavism |
Codes:
| I | II | III | IV | |
| 1. | 1 | 2 | 3 | 4 |
| 2. | 2 | 1 | 4 | 3 |
| 3. | 2 | 1 | 3 | 4 |
| 4. | 1 | 2 | 4 | 3 |
What is true about the isolated small tribal populations?
| 1. | There is no change in population size as they have a large gene pool. |
| 2. | There is a decline in population as boys marry girls only from their own tribe. |
| 3. | Hereditary diseases like color blindness do not spread in the isolated population. |
| 4. | Wrestlers who develop strong body muscles in their lifetime pass this character on to their progeny. |
In allopatric speciation, reproductive isolation is initially caused by:
| 1. | behavioral barriers | 2. | postzygotic barriers |
| 3. | geographic barriers | 4. | ecological barriers |
The occurrence of endemic species in South America and Australia is because:
| 1. | these species have been extinct in other regions |
| 2. | of continental separation |
| 3. | there is no terrestrial route to these places |
| 4. | of retrogressive evolution |
The bones of forelimbs of whales, bats, cheetahs, and men are similar in structure, because:
| 1. | one organism has given rise to another |
| 2. | they share a common ancestor |
| 3. | they perform the same function |
| 4. | they have biochemical similarities |
One of the important consequences of geographical isolation is:
| 1. | Random creation of new species |
| 2. | No change in the isolated fauna |
| 3. | Preventing speciation |
| 4. | Speciation through reproductive isolation |
Which of the following is the most important precondition for speciation to occur?
| 1. | Reproductive isolation | 2. | A crash of the population size |
| 3. | Adaptive radiation | 4. | Random mating |
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 |
- 1(current)
Q. No.
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