All cells in human body have same 46 chromosomes. Then how can cells functions different task? how they have different shape?
like liver cell, brain cell, skin cell

Question

All cells in human body have same 46 chromosomes. Then how can cells  functions different task? how they have different shape? 
like liver cell, brain cell, skin cell

anonymous · Answer

yes, all cells have the same DNA and the same 46 chromosomes. but, the different traits on these chromosomes may or may not be brought out in different cell. i.e. Those traits are not active in normal cells. Take for example a nerve cell and the insulin producing beta cells in the pancreas. Both have the capacity or ability to produce insulin, but this ability is rendered  active only in the beta cells, not in the nerve cells. how exactly does it know where to be active and not active? that i'm not sure. (and if that was your precise question, then oops, my bad. :P)

anonymous · Answer

good answer. You got question correctly.

But how cell know that who they are? means how yhey know i am nerve cell and i shoudnt produce insulin?

rogue · Answer

The process of cell differentiation is extremely complex. If you want to read up on it, try these http://www.nature.com/scitable/topicpage/gene-expression-regulates-cell-differentiation-931 http://answers.yahoo.com/question/index?qid=20080920170337AAkuMaS