(a) State Mendel's first law of inheritance.
(b) How the age of fossils is obtained by carbon dating?
(a) According to Mendel's first law of inheritance the characteristics (or traits) of an organism are determined by internal 'factors' which occur in pairs. Only factor of each pair of such factors can be present in a single gamete.
(b) All the living objects contain some carbon-14 atoms which are radioactive. When a living object dies and forms fossil, its carbon-14 radioactivity goes on decreasing gradually.
In the carbon dating method, the age of fossils is found by comparing the carbon-14 radioactivity left in fossils with the carbon-14 radioactivity present in living objects today.
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