Do Now: Even
• Yondr phone and put in plastic container
• Complete Warmup for Day 65:
• Is this a picture of independent
assortment or crossing over? Explain.
• Pick up and Complete Advisory 3 Student Support Plan (I will sign when I come around)
• Have the following ready for a stamp:
• Meiosis Homework
Do Now: Odd
• Yondr phone and put in plastic container
• Complete Warmup for Day 65 (write “Identical Twin Babies” as question):
• Sally and Harry fall in love. They introduce Sally’s identical twin,
Emily, to Harry’s identical twin, Ken. Soon there is a double
wedding where Sally marries Harry and Emily marries Ken. Both Sally and Emily get pregnant. They wonder “Will their babies look exactly alike?” Answer their question, and explain your reasoning.
• Pick up and Complete Advisory 3 Student Support Plan (I will sign when I come around)
• Objective: SWBAT
• Predict the genotypes and phenotypes of offspring given the genotypes and phenotypes of the parents
• Agenda:
• Review last part of Meiosis
• Biomanbio Intro to Mendelian Genetics
• Mendelian Genetics Check for Understanding • Punnett Square Practice
• Homework:
• Finish any classwork due Monday • Student Support Plans due Mon
• Day 65 Notebook Check today! (can get extension up to Monday if needed)
Odd: Warmup Review
• Sally and Harry fall in love. They introduce Sally’s identical twin,
Emily, to Harry’s identical twin, Ken. Soon there is a double
wedding where Sally marries Harry and Emily marries Ken. Both Sally and Emily get pregnant. They wonder “Will their babies look exactly alike?” Answer their question, and explain your reasoning.
• No! There is a very tiny chance they could but:
• Independent Assortment and Crossing Over can happen differently in
the mothers creating different possible eggs
• Independent Assortment and Crossing Over can happen differently in
the fathers creating different possible sperm
• Even if they create identical eggs and identical sperm those identical
Even Warmup Review
• Is this a picture of
independent assortment or crossing over? Explain.
• Crossing Over!
• Pieces of homologous
Even: Day 65: Genetic
Variation Notes
• Independent Assortment:
• Each pair of homologous chromosomes can line up
differently
• “Mom” chromosomes doesn’t have to all be on one side
Even Day 65: Genetic
Variation Notes
• Crossing Over• Little pieces of chromatids swap between homologous
chromosomes
• Creates new combinations of alleles on the same
Meiosis Genetic Variation
Analysis Question
• Sally and Harry fall in love. They introduce Sally’s
What if Meiosis doesn’t
happen as planned?
• Nondisjunction: chromosomes don’t separate during
meiosis and cells either get an extra chromosome or one less chromosome
Effects of Nondisjunction
• Trisomy
• Down Syndrome
• The child ends up with 3 21st
chromosomes
• Most trisomies in pairs 1-5
end in death before the baby even develops. Predict why an extra copy of
Effects of Nondisjunction
• Klinefelter Syndrome (XXY)
• Sterile, taller, poor
coordination, weaker muscles, less body hair, breast growth
• Turner Syndrome (X)
• Short neck, low ears, short
stature, do not develop breasts, do not have
menstrual periods, sterile
• XYY Syndrome
• Taller than average but
Now that we know how
parents pass on their
genes to kids…
• …how do those genes combine to form the traits
Gregor Mendel: “Father of
Genetics”
• Tended the garden when he was a monk in the
1800s in what is now the Czech Republic
• Experiment with pea plants
• Easy to breed
Mendel’s Experiments
• During his breeding experiments
(crosses), Mendel used certain vocabulary to name the
generations of plants:
• P = parental generation
• F1 = first generation of offspring • F2 = second generation of
offspring
Mendel’s Experiments
• When he crossed a tall plant with a tall plant, what
type of offspring do you think he got?
• Tall plants!
Mendel’s Experiments
• When he crossed a short plant with a short plant
what type of offspring do you think he got?
• Short plants!
Mendel’s Experiments
• When he crossed tall plants with short plants what
do you think he got?
• ALL TALL PLANTS!
• P: Tall x Short F1: Tall
• What did Mendel do next?
• He crossed the tall F1
plants from the previous cross with each other to see what would happen…
• When he did this, he got
more interesting results--what do you think
happened??
•
The results of the
F1 cross were:
•
75% tall plants
•
25% short plants
•
Why did the short
trait reappear in the
F2 when it wasn’t
observed in the F1?
•
Use the Snurfles to explore the vocabulary
and rules of Mendelian Genetics
•
These will be your notes so pay attention and
ask questions if you have them!
End of Class: Period 4
• Finish Biomanbio and do Check for Understanding
for Homework due Mon
• Signed Student Support Plan due Mon
End of Class: Period 8
• Do Biomanbio for Homework due Mon
• Signed Student Support Plan due Mon
Punnett Square Set-Up
Example
• A female cow who is heterozygous for the trait of
Sticky Tongue (T) is crossed with a homozygous
Mendelian Genetics Check
For Understanding
• Individually complete the Check For Understanding in the next 8 minutes to the best of your ability
• Check your Answers by putting checks or x’s. You can write the correct answer but don’t change yours!
• 1a. Phenotype
• 1b. Genotype
• 1c. Phenotype
• 2a. Heterozygous
• 2b. Homozygous Recessive
• 3a. Black Hair
• 3b. Black Hair
• 3c. Blonde Hair
• 4. Genotype: 100% Gg; Phenotype: 100% Purple Skin
• 5. Genotype: 50% Yy, 50% YY; Phenotype: 100% Yellow
Punnett Square Practice
Stations
• 3 Stations:
• 0-8 points: Teacher Help • 9-10 points: Group Help
End of Class: Period 1
• Put Check for Understanding in Notebook for Monday
• No HW
• Complete Exit Ticket for Day 65:
• In pea plants tall is dominant and short is recessive. A plant has a genotype of Tt.
• Is their genotype homozygous or heterozygous?
• What is their phenotype?
• Turn in Exit Ticket page
