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प्रश्न
Why only left ovary and oviduct arc present in birds?
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उत्तर १
Only left ovary and oviduct are present in birds to reduce body weight and is an adaptation for flying.
उत्तर २
Only left ovary and oviduct are present in birds to reduce body weight and is an adaptation for flying.
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संबंधित प्रश्न
How would the gene flow or genetic drift affect the population in which either of them happens to take place?
Long answer question.
Explain the different factors responsible for genetic variations.
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 ______
Reproductive isolation does not occur due to ______.
Industrial melanism is one of the best example for ______.
Ethological isolation is due to differences in ______
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?
Define the term:
Genetic drift
