![](http://2.bp.blogspot.com/-IZpr3GCB3iU/TZ-um7NFyPI/AAAAAAAAAKw/57VYwuWbFmM/s320/%25C3%25ADndice.jpeg)
Cells of same type express genes differently, so phenotypic differences emerge in same type of tissue. E.g., occurs by X chromosome inactivation in female mammals; also by nondisjunction in any cell after fertilization (only descendants of altered cell inherit the abnormal chromosome number).
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