Biology - Evolution Question with Solution | TestHub
Select the correct statements regarding Sewall Wright effect.
A) It shows random fluctuation in allele frequency.
B) It is random or directionless.
C) It occurs in large and free interbreeding population.
D) Allele frequency of new population is different from original population.
E) Only Dominant allele is eliminated due to natural disaster.
Options:
Answer:
Solution:
Sewall Wright effect is another name for genetic drift.
Statement A is correct because genetic drift refers to the random fluctuation in allele frequencies over generations.
Statement B is correct as genetic drift is a random and directionless process, unlike natural selection which is directional.
Statement C is incorrect because genetic drift operates effectively only in small populations, not in large, freely interbreeding populations.
Statement D is correct because the random changes in allele frequencies can lead to a new population having a significantly different genetic makeup from the original population (e.g., founder effect or bottleneck effect).
Statement E is incorrect because genetic drift affects alleles randomly, regardless of whether they are dominant or recessive. It does not selectively eliminate only dominant alleles during a natural disaster.
Therefore, statements A, B, and D are correct.
Answer: A, B and D only
