Ncert Exercises & Solutions

Industrial melanism observed in moth, Biston betularia, is which type of selection?

1. Stabilising

2. Directional

3. Disruptive

4. Artificial

(b) Directional selection is observed in moth, Biston bemlaria is industrial melanis. Under this, individuals at one end of the frequecny distribution do well lifht and so more individuals of that type will be present in next generatin.

The other options are incorrect, because in stabilising selection, average sized individuals are favoured . e.g., weight of new-born babies and in disruptive selection both extremes are favoured, while intermediate varieties are eleminated, e.g., black belied seed crackeer, Pyrenestes ostrinus.

ln artificial selection, the individuals with desirable characteristics are deliberately selected to proiduce a progeny with all those characteristics.

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