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page 1 The Punnett Square (Extension) Directions: 1. Fill in the parents’ gene type. Then complete the Punnett square to determine the gene type of each offspring. 2. Underneath each square record the characteristic and ratio for each gene type. Remember: A capital letter indicates a dominant gene and lower case indicates a recessive gene. R = tongue roller r = non tongue roller Mother’s Genes Square 1 Mother is tongue roller (Rr) Father is tongue roller (Rr) Father’s Genes Square 1 Gene Type Inherited Tongue Type Ratio Generalization: _________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ KC 4 Science © 2008 Kent ISD page 2 The Punnett Square (Extension continued) Directions: 1. Fill in the parents’ gene type. Then complete the Punnett square to determine the gene type of each offspring. 2. Underneath each square record the characteristic and ratio for each gene type. Remember: A capital letter indicates a dominant gene and lower case indicates a recessive gene. R = tongue roller r = non tongue roller Square 2 Mother is not a tongue roller (rr) Father is tongue roller (RR) Mother’s Genes Father’s Genes Gene Type Inherited Tongue Type Ratio Square 2 Generalization: _________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ KC 4 Science © 2008 Kent ISD page 3 The Punnett Square (Extension continued) Directions: 1. Fill in the parents’ gene type. Then complete the Punnett square to determine the gene type of each offspring. 2. Underneath each square record the characteristic and ratio for each gene type. Remember: A capital letter indicates a dominant gene and lower case indicates a recessive gene. R = tongue roller r = non tongue roller Square 3 Mother’s Genes Mother is not a tongue roller (rr) Father is tongue roller (Rr) Father’s Genes Square 3 Gene Type Inherited Tongue Type Ratio Generalization: _________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ ___________________________________________________________________ KC 4 Science © 2008 Kent ISD