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प्रश्न
Explain Geographical Isolation
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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
Why only left ovary and oviduct arc present in birds?
Transfer of gene between the population that differ genetically from one another is called _____.
(A) Gene mutation
(B) Gene flow
(C) Genetic drift
(D) Genetic recombination
The proportion of an allele in the gene pool to the total number of alleles at a given locus is called _______.
All are post zygotic barriers, EXCEPT
Hybrids develop to maturity but become sterile due to failure of proper gametogenesis. This is a post mating barrier called ____________.
Chromosomal aberration causing no loss or gain of gene complement of the chromosome is called ____________.
The modem synthetic theory of evolution does NOT include ____________.
____________ brings about evolutionary changes by favouring differential reproduction of genes.
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?
