Punnett squares are used to predict the possible combinations of dominant and recessive genes that will be passed on from parents to offspring. The dominant genes from the father are written along the top of the square and the mother's recessive genes are written along the side. Each box represents a possible genetic combination, with the dominant genes always being placed first and the recessive genes last in each box. The percentage of each combination can be determined by the number of boxes showing that combination, with each box representing 25% of the total offspring.

1. PUNNETT SQUARES
Science

2. THIS IS A PUNNETT
SQUARE
You put the
Father or
dominate genes
here. Dominate is
ALWAYS capital.

3. THIS IS A PUNNETT
SQUARE CONT.
The mother or
recessive genes
go here. Recessive
is ALWAYS
lowercase.

4. NOW LET'S SOLVE.
We have GG and Gg G=
Green g= Yellow
So we put the dominate
genes here, and the
recessive genes here.
You can use any letter
as long as it’s the same
for both.

5. NOW LET'S SOLVE.
First you bring down the
Dominates . Dominates
ALWAYS go first. Then
you do the recessives.
Recessives ALWAYS go
last.

6. LET'S SOLVE:
PERCENTAGES
Each box is 25% so we
can gather the total of
GG, Gg, and gg by
knowing that each box is
25%.

7. LET'S SOLVE
PERCENTAGES
What is the percentage of...
GG:
Gg:
gg:
50%
50%
0%

8. The End...