How do particular traits or characteristics get expressed ?

Ans. 1. Cellular DNA is the source of information for synthesizing proteins in the cell. 

2. A fragment of DNA that provides complete information about one protein is referred to as gene for that protein. 

3. For eg. ‘tallness’ is a trait. In plants growth hormones are present. The height gained by plants depends upon the amount of growth hormone produced by the plant. 

4. The quantity of hormones produced by the plants depends upon the efficiency of the concerned enzyme. 

5. Efficient enzymes produce hormones in greater quantity resulting in the plants gaining height and thus becoming tall. On the other hand, if the enzymes are less efficient, they produce less quantity of growth hormone which results in stunted growth of plants.

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