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प्रश्न
Explain Geographical Isolation
उत्तर
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.
संबंधित प्रश्न
Give any ‘two’ factors responsible for genetic variation.
Long answer question.
Explain the different factors responsible for genetic variations.
What is Genetic variations?
Match the columns and choose the correct option.
| Column I | Column II | ||
| i. | Ecological isolation | a. | Sexually mature at different times of the year |
| ii. | Ethological isolation | b. | Specific mating behaviours |
| iii. | Mechanical isolation | c. | Difference in structure of mating organs |
| iv. | Seasonal isolation | d. | Same geographic region but separate habitat |
______ is the separation of the population of a particular species into smaller units which prevents interbreeding between them.
Identify the method of reproductive isolation, when members of a population attain sexual maturity at different times preventing interbreeding.
The modem synthetic theory of evolution does NOT include ____________.
____________ brings about evolutionary changes by favouring differential reproduction of genes.
Fertilization between opposite mating gametes leads to ______.
Define the term:
Genetic drift
