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The change of the lighter-coloured variety of peppered moth (Biston betularia) to its darker variety (Biston...

The change of the lighter-coloured variety of peppered moth (Biston betularia) to its darker variety (Biston carbonaria) is due to

(a) mutation

(b) regeneration

(c) genetic isolation

(d) temporal isolation.

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Answer #1

Industrial melanism is the process in which the moths living in the industrial areas to develop the black colour due to melanin pigment to match the body to shoot covered background on the trees.

Industrial melanism is observed in the mouth of Biston betularia living. The peppered moth is in two forms one is melanin forms due to melanin pigment and non-melanic forms due absence of melanin pigment and are Biston betularia typica.The change of lighter coloured variety of peppered moth Biston betularia to its darker variety (carbonara) is due to mutation of single Mendelian gene for the survival in the industrial environments especially in the smoke conatining industries.

Hence option (a) is correct.

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