Genetic Drift
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Assertion:Genetic drift is the change in allele frequencies of a population
Reason: Genetic drift always takes place in the large populations.
A and B both are true
A is true, B is false
A is false, B is true
Both A and B are false
Can genetic drift lead to extinction?
Question 1
What are the factors could lead to the rise of a new species?
What are two common causes of genetic drift?
A very small population of a species faces a greater threat of extinction than a larger population. Provide a suitable genetic explanation.
- It occurs accidentally
- Only effective on larger population
- Always provides survival advantage
- Traits are naturally selected
Is genetic drift mutation?
What describes genetic drift?
Statement 1: It is more effective in smaller population.
Statement 2: Variations within a species can contribute to genetic drift
Statement3: It can lead to speciation.
- Only statement 1 is correct.
- Only statement 2 is correct.
- Only statement 3 is correct.
- All the statements are correct.
- natural selection
- speciation
- genetic drift
- artificial selection
Question 37
Does geographical isolation of individuals of a species lead to the formation of new species? Provide a suitable explanation.
Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics?
- Population A is more stable than population B.
- Population B is more stable than population A.
- Both population A and population B are stable.
- Stability cannot be determined from the presence or absence of variations.
- genetic drift
- natural selection
- phylogenetic variation
- artificial selection
- All of the above
- Homology
- Recapitulation theory
- Atavism
- Only effective on larger population
- Traits are naturally selected
- It occurs accidentally
- Always provides survival advantage
(i) Thomas Malthus - Principle of population
(ii) Paul Kammarer - Proteus anguimia
(iii) Hugo de Vries - Oenothera lamarckiana
(iv) Bernard Kettleweli - BIston betularia
- i, iv
- ii, iv
- i, iii
- All are correct
- genetic drift
- natural selection
- phylogenetic variation
- artificial selection
Question 3
Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics?
- Mutation
- Natural calamities
- All of the above
- Continental drift
Explain me all the important terms related to Herdity and Evolution.
- Simpson
- Wallace
- Nuttall
- Lemaitre
Genetic drift is a change of
Appearance of recessive genes
Gene frequency from one generation to next
None of the above
Gene frequency in same generation
A species may be reproductively isolated through which of the following causes?
Geographical conditions
Behaviour
Anatomy
Ecology
name the two major factors which are responsible for specification