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Question
Explain Geographical Isolation
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
Long answer question.
Explain the different factors responsible for genetic variations.
The proportion of an allele in the gene pool to the total number of alleles at a given locus is called _______.
What is hybrid sterility?
The change in gene and gene frequencies caused due to various aspects like mutation recombination and migration is called ______.
Match the columns and choose the correct option.
| Column I | Column II | ||
| i. | Zygote mortality | a. | Hybrid develops to maturity but becomes sterile |
| ii. | Hybrid sterility | b. | Egg is fertilized but zygote dies |
| iii. | Gamete mortality | c. | Union of two gametes does not occur in the iven time |
Which of the following phenomena results in genetic recombination?
The structural, morphological change chromosome due to rearrangement is called ____________.
Physical isolation is also called ______.
Domestic wheat, which has 42 chromosomes, is probably hexaploid (6n), whereas the haploid number in the ancestral ones was 7. Find out the right reason as to how are such plants produced?
Which event is represented by the above diagram, related to chromosomal aberrations?
