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Question
Explain Geographical Isolation
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Solution
Geographical isolation (Physical isolation):
- It occurs when an original population is divided into two or more groups by geographical barriers such as rivers, oceans, mountains, glaciers, etc.
- These barriers prevent interbreeding between isolated groups. The separated groups are exposed to different kinds of environmental factors and they acquired new traits by mutations.
- The separated populations develop distinct gene pools and do not interbreed. Thus, new species have been formed by geographical isolation. e.g. Darwin’s Finches.
RELATED QUESTIONS
State the following:
Theory of recapitulation
How would the gene flow or genetic drift affect the population in which either of them happens to take place?
Long answer question.
Describe the different types of reproductive isolations.
Long answer question.
Explain the different factors responsible for genetic variations.
Genetic drift is more significant in ______
Black colored form became dominant over the light colored form in England during industrial revolution after 1845. This can be owed to ______.
Which statements are TRUE regarding genetic recombination?
- It occurs in asexually and sexually reproducing organisms.
- They occur due to random union of gametes, anaphasic separation of chromosomes, and crossing over.
- New genetic combinations result in variation.
Reasons for diversity in a living being is:
Match the following
| Column A | Column B | ||
| (i) | Dryopithecus | (a) | Java and Peking |
| (ii) | Ramapithecus | (b) | Toung in South Africa |
| (iii) | Australopithecus | (c) | Lake Victoria of Africa |
| (iv) | Homo erectus | (d) | Shivalik hills in India |
Which of the following is a pre-mating mechanism of isolation?
