What is the term that describes traits involving more than one gene pair?

There are a number of terms depending on the specific genetic interaction and the context in which it occurs, but the most general one would be 'polygenic.' Poly - "multiple," Genic - "to do with genetics." 

Silicon is cut into tiny pieces for computer chipslead is melted to form pelletsliquid water freezes to form ice

Centriole.centrioles are present in animal cells but are usually absent in plant cells.