Master Objective: I will
evaluate and construct
Punnett Squares.
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Essential Question: How
can you use the pattern of
inheritance to predict
possible out comes of
offspring?
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Cornell Notes
In textbook chapter 6.5
•
•
•
•
•
What is a Punnett Square?
Draw an example of a Punnett Square.
How many alleles exist for each gene?
What happens to alleles during meiosis?
How many alleles for a gene are in each
gamete?
• What is a monohybrid cross?
Cornell Notes
In textbook chapter 6.5
• Draw an example of a homozygousehomozygous cross.
• Draw an example of a heterozygousheterozygous cross.
• Draw an example of a heterozygoushomozygous cross.
• What is a test cross?
• From and FFxFf cross, what percent ofoffspring
would have purple flowers?
Cornell Notes
In textbook chapter 6.5
•
•
•
•
What is a dihybrid cross?
What is Mendel’s 1st law of genetics? Explain
What is Mendel’s 2nd law of genetics? Explain
What is the phenotypic ratio for a dihybrid
cross in which both parents are heterozygous
for both traits?
• What is probability?
• How is it calculated?
Summary Time
• You know the drill!
Page 44
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Punnett Square Practice
• What are the 2 alleles associated with
brown chickens?
• Which one is dominate?
• What is the phenotype for this allele?
• Which one is recessive?
• What is the phenotype for this allele?
• Draw the Punnett Square and fill it in?
Page 44
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Punnett Square Practice
• What is the genotypic ratio for this cross?
• What is the phenotypic ratio for this cross?
• How often would you expect to see brown
chickens with this cross?
• Draw the Punnett Square for the two
lemmings. Include your selection.
• Assuming the alleles A and a are for color and
a is for albinism. How many of the offspring
are carriers?
Page 44
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Punnett Square Practice
• Which 2 of the offspring would give you a
greater than 25% rate for albinism? Write
their genotype.
• Draw the Punnett Square for the two
lemmings. Include your selection.
• What were your results?
• What two traits will you be breeding for in
this last challenge?
Page 44
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Punnett Square Practice
• What is the Punnett Square called that
shows 2 traits?
• After selecting your lemmings write down
the number and the alleles for each. Do this
each time you attempts a breeding pair.
• What was the Punnett Square for your
successful cross?