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प्रश्न
What is Genetic variations?
What are genetic variations?
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उत्तर
Genetic variation is the difference in DNA sequences between individuals within a population. Variation occurs in germ cells, i.e., sperm and egg, and also in somatic (all other) cells. Only variation that arises in germ cells can be inherited from one individual to another and so affect population dynamics, and ultimately evolution. Mutations and recombination are major sources of variation.
संबंधित प्रश्न
Define the term gene flow.
According to Abiogenesis, life originated from ______.
What is ‘gene flow’?
All are post zygotic barriers, EXCEPT
______ changes the genes rearrangement (order or sequence) resulting in variation.
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 |
Hybrids develop to maturity but become sterile due to failure of proper gametogenesis. This is a post mating barrier called ____________.
Loss of gene from chromosome occurs due to ______
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?
If the members of two different populations do not interbreed due to difference in the structure of reproductive organs, then it is called ______ isolation.
