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प्रश्न
Name any three types of postmating isolating mechanisms.
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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
Explain the concept ‘survival of the fittest’.
List three distinguishing features, in tabular form, between acquired traits and the inherited traits.
Give the respective scientific terms used for studying the development of new type of organisms from the existing ones.
What is meant by acquired and inherited traits? Explain with one example each.
Scientists believe that all life originated in :
(a) the sea
(b) the soil
(c) the ground
(d) the air
A population of red beetles lives in green bushes in a garden. Once during the process of breeding, a green beetle is produced.
(a) State whether the change in colour of beetle is a process of evolution or not.
(b) Can the new colour of green beetle be passed on to its next generations?
(c) What will be the advantage (if any) of the green colour to the beetle?
(d) State whether the production of green colour involved a change in genetic material or not.
Complete the statement by choosing correct options from below .
Evolution means -- -- -- --.
Explain the following :
(a) Speciation
(b) Natural Selection
Define the Gene frequency.
What is chromosomal aberration? Give any two types of aberrations found in the population.
