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2024_CBSE_Biology_Set_Region5_Subset_Set1_Q33___p12_14

(a) Natural selection operates in different ways in nature.

(i)Identify the type of natural selection depicted in the graph above.(ii)In England after industrialisation, the population of dark winged moths were more favoured than white winged moth. Explain.(iii)Anthropogenic action can enhance the rate of evolution. Explain with the help of an example.

OR

(b) (i) Why did Hershey and Chase use ' $\displaystyle { }^{35} \mathrm{~S}$ ' and ' $\displaystyle { }^{32} \mathrm{P}$ ' in their experiment? Explain.(ii)State the importance of (1) blending and (2) centrifugation in their experiment.(iii)Write the conclusion they arrived at the end of their experiment.

Biology · Molecular Basis of Inheritance