February 3, Week #
4 NB-86
Learning Target: I will
Agenda:
• complete a Punnett
Square to predict
genotypes and
phenotypes of the
offspring.
• Check homework (Cornell
notes 179-80)
• Genotype/Phenotype sort
• Heredity Simulation (NB-88)
• Punnett Squares(NB-87)
Homework:
• NB-87 and 88
Essential Question:
• How can you
predict traits of
offspring?
Learning Target: I will
• Complete a Punnett Square to predict
probability in percentages and ratios of
genotypes and phenotypes.
• A genotype is
• The DNA coding for a trait (EE)
• A phenotype is
• The trait we observe (free earlobes)
• A percentage is an amount compared to
100.
• A ratio is a relation between 2 numbers
Genotype/Phenotype Sort
• Look through the words and find
GENOTYPE AND PHENOTYPE
• Place them at the top of your desk.
• Next, go through the remaining
words/pictures and decide if they are
genotypes or phenotypes.
• Place them in the appropriate column.
Learning Target: I will
• Complete a Punnett Square to predict
probability in percentages and ratios of
genotypes and phenotypes.
• A genotype is
• The DNA coding for a trait (EE)
• A phenotype is
• The trait we observe (free earlobes)
• A percentage is an amount compared to
100.
• A ratio is a relation between 2 numbers
Heredity Simulation, NB-88
• I need 3 volunteers:
–1 boy
–1 girl
–1 person to write on the board
Heredity Simulation, NB-88
• Look at #5 on the back: Determine the
percentage of offspring from your data
table.
• Percentage= Total # of offspring with trait
Total # of offspring (=8)
Punnett Squares: Animation
• Mendel figured out how to predict the
percentage of offspring with a particular
trait. He was the first one to do this and this
is why we call him the “father of genetics”
• http://www.dnaftb.org/5/concept/index.html
Learning Target: I will
• Complete a Punnett Square to predict
probability in percentages and ratios of
genotypes and phenotypes.
• A genotype is
• The DNA coding for a trait (EE)
• A phenotype is
• The trait we observe (free earlobes)
• A percentage is an amount compared to
100.
• A ratio is a relation between 2 numbers
Punnett Squares Practice, NB-87
1. Purple flowers are
dominant to white
flowers.
Determine the phenotype of
the following:
PP
Pp
pp
• PP= purple
• Pp= purple
• pp= white
Punnett Squares Practice, NB-87
5. Straight hair is dominant
to curly.
Determine the genotype of
the following:
straight
straight
curly
• Straight= SS
• Straight= Ss
• Curly= ss
7. Set up the cross: Rr x rr. Round seeds are dominant
to wrinkled seeds. What are the genotypes and
phenotypes of the parents?
Phenotype= wrinkled seeds
Punnett Square
r
r
r
rr
Offspring
R
Male gametes
Rr
Genotype=
Phenotype=
round seeds
Parents
Female gametes
Genotype=
7. Set up the cross: Rr x rr. Round seeds are
dominant to wrinkled seeds. Next, complete
the cross
Punnett Square
r
r r
r
r r
R
r
Male gametes
Phenotype= round seeds
Genotype= Rr
Parents
Female gametes
Phenotype= wrinkled seeds Genotype= rr
Offspring
R r
Rr
7. Set up the cross: Rr x rr. Round seeds are
dominant to wrinkled seeds. What are the
phenotypes of the offspring?
Punnett Square
R
r
Male gametes
Phenotype= round seeds
Genotype= Rr
Parents
Female gametes
Phenotype= wrinkled seeds Genotype= rr
r
r
r r
r r
wrinkled
R r
round
wrinkled
Rr
round
Offspring
7. Set up the cross: Rr x rr. Round seeds are
dominant to wrinkled seeds. What percentage
of the offspring will be round?
Punnett Square
R
r
Male gametes
Phenotype= round seeds
Genotype= Rr
Parents
Female gametes
Phenotype= wrinkled seeds Genotype= rr
r
rr
r
rr
wrinkled wrinkled
¼ x 100= 25% ¼ x 100= 25%
Rr
round
Rr
round
¼ x 100= 25% ¼ x 100= 25%
25% + 25%= 50% will be round
Offspring
Learning Target: I will
• Complete a Punnett Square to predict
probability in percentages and ratios of
genotypes and phenotypes.
• A percentage is
• an amount compared to 100.
• A ratio is
• a relation between 2 numbers
• A punnett square is used to
• Predict traits in offspring
Fake Student Grade
• Graph it!
Grades
• Look at your grade.
• Fill out the Tracking My Own Learning
sheet and graph your grade.
Organize Notebooks and start
working on your homework (NB87 and 88)
Fill out the weekly planner.
Don’t forget the homework on
NB-87 and 88!