What is used to keep track of the gametes and possible offspring combinations

punnett square

Explanation:

The punnett square refers to the grid structure that is used to predict the outcome of a genetic cross. It was first developed by Reginald Punnett and hence named so. For the purpose, the types of gametes and their respective frequencies from a parent are written across the top. The gametes and their frequencies from the other parent are written on the left side of the grid. The squares are then filled in with the resulting combinations of gametes from the two parents. In this way, a punnett square allows direct calculation of the probabilities of occurrence of all possible offspring of a genetic cross.