In humans, there are generally two types of traits: tall and dwarf . then ,some persons are seen to be very tall and very short .why??

Dear Student. 
 
This happens due to over and under secretion of growth hormone. Growth hormone secreted by pituitary gland is known as somatotropin (STH). It is dependent on our diet because its release is activated or inhibited according to our diet, like low glucose level inhibit the release of growth hormone. The growth hormone produced by the pituitary gland is responsible for the growth of different body cells including muscles and bones. It is responsible for the growth of different organs of the body.

The secretion of the growth hormone should be specific, because the excess and deficiency both result in the abnormalities.
1. Excess - The oversecretion of the hormone can cause acromegaly (excess thickening of the bones) or the gigantism (excessive growth).
2. Deficiency - The under secretion of the hormone can result in the growth failure and short stature i.e dwarfism.

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Regards.  

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