1. Do now activity #3
In pea plants, yellow seed color (Y) is dominant over green seed color (y). Complete the cross between a plant that is heterozygous for yellow seeds and a plant that is homozygous recessive.

2. Do now activity #4
What is the difference between dominant and recessive traits?
What is the difference between heterozygous and homozygous genotypes?
How does the genotype of an organism determine the phenotype of that organism?

3. Do now activity #4
Dimples (D) is dominant over no dimples (d). A woman heterozygous for dimples has a child with a man heterozygous for dimples.
*Use a punnet square to determine the probability of the couple having a child without dimples.

4. Section 5-3: Punnet Squares
Essential Question:
How can a punnet square be used to predict the probability of offspring genotypes and phenotypes based on the parents genotype?
Learning Target
Use a punnett square to predict the probability of offspring genotypes and phenotypes based on the parents genotype.
Section 5-3: Punnet Squares

5. Last day to turn in LATE WORK is 11/30/16.
announcements
Biology Tutoring this week:
Lunch B (Tuesday & Thursday)
7:00AM (Monday – Friday)
After school Biology Tutoring: Tuesday
Last day to turn in LATE WORK is 11/30/16.

6. announcements Available Extra Credit: Tissue Box = 2 Points
Color Printer Paper = 10 Points Plastic Pencil Box = 5 Points
Canned Food = 1 Point

7. Don’t forget to chunk your notes!

8. Probability: the likelihood that an event will occur.
overview
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Probability: the likelihood that an event will occur.

9. When you flip a coin, what is the probability that you will get Tails?
overview
When you flip a coin, what is the probability that you will get Tails?
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10. The probability of a particular event occurring from a coin toss is
overview
Example: Coin Toss
The probability of a particular event occurring from a coin toss is
½ or 50%
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11. overview Example: Coin Toss Possible events:
Heads = ½ or 50% probability
Tails = ½ or 50% probability
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12. Traits
Based on genetic information, we can use a Punnet Square to determine the probable traits of our children.
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13. Traits are controlled by genes
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14. Punnet squares Steps Define your letters Set up your cross-breed
Draw your Punnet Square
Law of Segregation
Solve the Punnet Square
Calculate probabilities
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15. Mono-Hybrids: crosses between parents for a ______ trait.
Punnet squares
Mono-Hybrids: crosses between parents for a ______ trait.
Examples:
Dimples, Cleft chin, Freckles, Widow peak
single

16. Punnet squares
In humans, tongue rolling is dominant over non-tongue rolling. Use a Punnett square to predict the probability of having a non- tongue rolling baby for a cross between a person heterozygous for tongue rolling and a person who is homozygous for non-tongue rolling.
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17. Question! Heterozygous for tongue rolling And
homozygous for non-tongue rolling.
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18. Punnet squares
Di-Hybrids: crosses between parents for two ________ traits.
Examples:
Freckles & Cleft chin
Dimples & Widow peak
different

19. Punnet squares Di-Hybrid = combining 2 different traits
Ex. Freckles x Dimples

20. Alleles separate during ______ formation
Law of segregation
Alleles separate during ______ formation
gamete

21. Law of segregation Dominant Allele The trait is always expressed
Shown by a capital letter
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22. Law of segregation Recessive Allele
Trait is expressed when a dominant allele is not there
Shown by lowercase letter
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23. Gametes Segregation Parent Generation D d D d
Baby
Generation DD Dd Dd dd
Results: DD = Dimples Dd = Dimples dd = no dimples
75% Dimples, 25% No Dimples

24. Punnet squares
In humans, straight thumb (S) is dominant over hitch-hikers thumb ( s ). Use a Punnett square to predict the probability of having a baby with hitch-hiker thumb for two people heterozygous for straight thumb.
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25. Question! And Heterozygous for straight thumb
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26. Question!
The allele for tall plant (T) is dominant over the allele for short plant (t). A homozygous tall plant is bred with a homozygous short plant.
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27. Question! How is it possible to have 100% TALL
pea plant offspring when the genes were
50% Tall (mom) and 50% Short (dad)?
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