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प्रश्न
Name any three types of postmating isolating mechanisms.
उत्तर
- Gamete mortality: Gametes have a limited life span. Due to one or the other reasons, if the union of the two gametes does not occur in the given time, it results in gamete mortality.
- Zygote mortality: Here, the egg is fertilized but the zygote dies due to one or the other reasons.
- Hybrid sterility: Hybrids develop to maturity but become sterile due to failure of proper gametogenesis (meiosis). e.g., Mule is an intergeneric hybrid that is sterile.
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संबंधित प्रश्न
What are the different ways in which individuals with a particular trait may increase in a population?
In what way are analogous organs evidence for evolution?
Give one example each of characters that are inherited and the ones that are acquired in humans. Mention the difference between the inherited and the acquired characters.
Write short notes based upon the information known to you.
Evolution
Explain the following :
(a) Speciation
(b) Natural Selection
Transfer of a part of chromosome or set of genes to a non-homologous chromosome is called ________.
____________ results in variation in gene frequencies within population by chance rather than by natural selection.
Theory of inheritance of acquired character was given by:
Which fossil animal is considered as the connecting link between reptiles and birds? Give any one character of each class found in it.
The first fossil of human form, discovered was ______.
