Question

Kettlewell found more dark moths in areas affected by industrial pollution than the light moths. This is due to

• A. Increased frequency of recessive allele responsible for dark colour which had more selective advantage
• B. Lethal mutation
• C. Increased frequency of dominant responsible for dark coloured moth which had more selective advantage
• D. High fecundity

Answer 1

The correct option is B Lethal mutation

• The evolution of the peppered or dark moth is an evolutionary instance of directional color change in the moth population as a result of air pollution during the Industrial Revolution.
• The frequency of dark-colored moths increased at that time is an example of industrial melanism.
  
• Lethal mutation can result in the death or reduce significantly the expected longevity of an organism carrying the mutation.

So the correct option is "Lethal mutation"