It was developed by a British geneticist, Reginold.C.Punnett.
It is a graphical representation to indicate all possible union of gametes during fertilization and to calculate the probability of all possible genotypes of offsprings in a genetic cross.
The possible gametes are written on two sides, usually the row and left columns.
All possible combinations of gametes during fertilization are represented in boxes below in the squares, which generates a square output form. So, the correct option is ‘Punnett’.