MHT CET · BIOLOGY · STD 12 - 5. Origin and Evolution of Life
Given below are the two statements.
Statement I: Directional isolation favours the intermediate forms phenotypic extremes. and eliminate both
Statement II: In directional isolation, more individuals acquire a value other than mean character value.
In the light of above statements, choose the correct answer from the options given below:
- A Both statement I and statement II are correct.
- B Both statement I and statement II are incorrect.
- C Statement I is correct but statement II is incorrect.
- D Statement I is incorrect but statement II is correct.
Answer & Solution
Correct Answer
(D) Statement I is incorrect but statement II is correct.
Step-by-step Solution
Detailed explanation
Directional natural selection acts to eliminate one of the extremes of the phenotypic range and favour the other, e.g., systematic elimination of homozygous recessives. Stabilizing natural selection tends to favour the intermediate forms and eliminate both the phenotypic extreme. E.g., more number of infants with intermediate weight survive better as compared to those who are over-weight or under-weight.
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