1. Notes: Punnett Squares

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

3. 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.

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

5. 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.

6. 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).

7. 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)

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

9. 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)