Question

Directional selection favours

• A. One extreme form over the other extreme form over intermediate form of a trait
• B. Both extremist form of trait
• C. Environmental differences
• D. Intermediate form of a trait

Answer 1

Answer: (A)

Directional selection is a mode of natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype. Under directional selection, the advantageous allele increases as a consequence of differences in survival and reproduction among different phenotypes.