Question

Recognize the figure and find out the correct matching :-

• A. a–directional, c–disruption, b–stabilisation
• B. b–directional, c–disruption, a–stabilisation
• C. c–directional, b–disruption, a–stabilisation
• D. b–directional, a–disruption, c–stabilisation

Answer 1

The correct option is B b–directional, c–disruption, a–stabilisation

The given graphs represent the operation of natural selection on different traits.

Graph A shows a selection of intermediate or heterozygous phenotypes while the extreme phenotypes (both dominant and recessive) tend to reduce in number. This type of natural selection is called stabilizing.
Graph B shows a directional shift in the peak, implying favouring and select of a particular phenotype. This type of natural selection is directional.

Graph C shows no presence of a particular peak, but two peaks signifying selection of extreme characters, both dominant and recessive. Also, the depression between the two peaks shows elimination or disfavoring of intermediate or heterozygous characters or phenotypes. This type of natural selection is disruptive.
So, the correct answer is option-b.