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प्रश्न
Read the following statement and justify the same in your own words with the help of a suitable example.
Geographical and reproductive isolation of organisms gradually leads to speciation.
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उत्तर
- Every species survives in specific geographical conditions, as the food and habitat requirements are specific for each species.
- Their reproductive ability and period are also different, so the individuals from one species cannot reproduce with individuals from other species.
- When they are separated by a distance or geographical barriers, they are said to be isolated geographically.
- When they cannot reproduce with each other, they are said to be isolated reproductively.
- The ancestor species of both these groups may be the same, but due to isolation over a very long-time duration, there is genetic variation between them. Therefore, this continuous isolation ultimately leads to speciation.
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संबंधित प्रश्न
Will geographical isolation be a major factor in the speciation of a self-pollinating plant species? Why or why not?
Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?
Only variations that confer an advantage to an individual organism will survive in a population. Do you agree with this statement? Why or why not?
Name one reptile in given case where higher incubation temperature leads to the development of :male progeny.
Name one reptile in given case where higher incubation temperature leads to the development of female progeny.
State one advantage of variation to a species.
What do you understand by the term variation?
Select the group which shares the maximum number of common characters.
What name is given to the sequence of gradual changes over millions of years in which new species are produced?
Name the famous book written by Charles Robert Darwin.
Why are human beings who look so different from each other in terms of size, colour and looks said to belong to same species?
Name five varieties of vegetables which have been produced from 'wild cabbage' by the process of artificial selection.
What is meant by a species?
State the various factors which could lead to the formation of new species.
Define Speciation.
Define speciation according to A.E. Emerson.
In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: Speciation is the reproductive isolation amongst once interbreeding population.
Reason: Genetic drift, Natural selection, and Severe DNA change can cause speciation.
Add a note on sympatric speciation.
Complete the following chart:
| Animals | Connecting link between | |
| (1) | Balanoglossus | ______ |
| (2) | ______ | Annelida and Arthropoda |
| (3) | Lung fishes | ______ |
| (4) | ______ | Reptiles and mammals |
| (5) | Seymouria | ______ |
| (6) | Fishes and Amphibia |
