- 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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