This free printable worksheet features two large-sized monohybrid cross Punnett squares. Students of Biology/Life Science can utilize each Punnett square to predict the possible outcomes of a genetic pairing of maternal alleles and  paternal alleles. The Punnett square is named for scientist Reginald C. Punnett. It helps biologists to determine the probability of offspring expressing a particular genotype or trait. Click here to print.