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Transcript 
PUNNETT SQUARES
What are the possibilities?
What are the
possibilities?
Punnett Squares
• Used to find the probability of
genes for an offspring.
PARENT 2
PARENT 1
What will the offspring look like?
• If freckles are a recessive gene,
what would offspring of two
heterozygous parents look like?
• ______
A absent
_____
a freckles
Aa
• Parent 1: ____________
Aa
• Parent 2: ____________
STEP 1
PARENT 2
• Write the genotype of Parent 1 at the top.
What would the offspring of two
• Write the genotype of Parent 2 along the
heterozygous parents be?
side.
APARENTa1
A
a
STEP 2
• Go down and across until two letters meet.
A
A
a
a
STEP 3
What percent of the offspring will have
• Each box is worth
percent.
freckles?
25
NO
AA
NO
Aa
NO
Aa
YES
aa
STEP 3
What percent of the offspring will be
• .
homozygous dominant?
YES
AA
NO
Aa
NO
Aa
NO
aa
STEP 3
What percent of the offspring will be
• .
heterozygous?
NO
AA
YES
Aa
YES
Aa
NO
aa
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