The punnett square of a dihybrid cross have 16 squares representing the possible offspring. true or false?

TRUE.

Furthermore, it gives the possible phenotypes of the offspring. A 4 square punnett square usually shows the possible phenotypes for one trait (hair color, skin color, eye color,etc) but a 16-sqaure Punnett square explores the possible phenotypes for the offspring of TWO traits (eg. in peas: their color and whether or not they are wrinkled)