Question

What is the varia%on present in the popula%on?

A. The insec+cide

B. The co1on

C. Insec+cide resistance in the bollworm D. The farmer.

What is the selec%ve agent in this example?

A. The insec+cide

B. The co1on

C. Insec+cide resistance in the bollworm D. The farmer.

Natural Selec+on: True Story

• The co1on bollworm is a serious pest of co1on.

• Insec+cides were heavily used to control the pests and save the crop.

• Over +me, the insec+cides became less and less effec+ve at killing the insects.

– Iden6fy the relevant varia%on in the popula6on. – Iden6fy the selec%ve agent.

– Describe the next genera%on in light of this selec%on (heritability)

Answer 1

1: Variation present in population: Insecticide resistance in the ballworm
Due to presence of insecticide resistance in population, the insecticide became less effective in time.
2: Selection agent: A. insecticide
Since presence of insecticide in system led to change in the population.
3: Next generation should have most of the ballworms with insecticide resistance. The ballworms with resistance were favored by natural selection. These ballworms left more number of progeny which will form the next generation.