Notes: Punnett Squares

Notes: Punnett Squares One parental allele goes in each spot around the outside of the Punnett Square.

Notes: Punnett Squares One parental allele goes in each spot around the outside of the Punnett Square. The offspring are inside the square – two alleles in each box.

Notes: Punnett Squares To fill in the Punnett Square, copy each male parent allele into each box to the right.

Notes: Punnett Squares To fill in the Punnett Square, copy each male parent allele into each box to the right. Copy each female parent allele into each box underneath it.

Notes: Punnett Squares The generations of parents or offspring are represented by numbers and letters: “P” represents the parental generation (one male parent, one female parent). F1 represents the first filial generation (the offspring of the P generation). F2 represents the second filial (if you mate two F1 offspring).

P generation, F1 generation, F2 generation P Grandpa Bean x Grandma Sophie F1 Uncle Richard Aunt Barbara My dad x My mom F2 Mark (my brother) Sarah(my sister) Me! (Mrs. Johnson)

Notes: Punnett Squares A cross for a Punnett Square is written like a formula: P1 = GG x gg

Notes: Punnett Squares A cross for a Punnett Square is written like a formula: P1 = GG x gg This means : in the parental generation (P1) a homozygous dominant (GG) is crossed with (x) a homozygous recessive (gg)