1. Bellwork: 12/1/15 Match the following terms to their examples
Homozygous dominant
Heterozygous
Dominant
Recessive
Phenotype
Blue eyes Aa BB A a
Have your alien page out for me to collect

2. Warm Up 12/7 Title: Dihybrid Crosses Page: 48 Date: 12-7-16
Essential Question: How can I find the probability of a child inheriting more than one trait?

3. Answer this question in your notebook (48.1)
Suppose that black hair (B) is dominant over blonde hair (b) and brown eyes (E) are dominant over blue eyes (e). The father has black hair (heterozygous) and brown eyes (heterozygous) and the mother has blonde hair and blue eyes. Genotype of father BbEe Genotype of mother - bbee
What are the chances you end up with a Blonde hair, blue eyed, offspring??

4. Announcements 10 9 11 13 14 8 12 7 2 1
End 3 4 6 5 15 16 26 25 27 28 30 29 17 24 19 18 23 20 21 22
Cat Half Sheet- 70 today tomorrow 50 Monohybrid cross practice- 50 today tomorrow 0 To make up your quiz, go see a biology teacher in the tutorial lab today after school.

5. Test Day=Friday

6. What traits do you see pictured below?
Fur color
Dihybrid Cross: a cross that shows the possible offspring for two traits
Fur length

7. What’s the phenotypic ratio?
9:3:3:1

8. Dihybrid Cross: a cross that shows the possible offspring for two traits
Fur Color: B: Black b:WhiteCoat
Texture: R: Rough r: Smooth
Heterozygous x Heterozygous
Their genotypes will be:
BbRr x BbRr

9. Dihybrid Crosses: a cross that shows the possible offspring for two traits
BBRR
BbRR
BbRr
BBRr
BBrr
Bbrr
bbRR
bbRr
bbrr
BbRr x BbRr
Fur Color: B: Black b: White
Coat Texture: R: Rough r: Smooth

10. How many of the offspring would have a black, rough coat?
How many of the offspring would have a black, smooth coat?
How many of the offspring would have a white, rough coat?
How many of the offspring would have a white, smooth coat? BR bR br Br
BBRR
BbRR
BbRr
BBRr
BBrr
Bbrr
bbRR
bbRr
bbrr
Fur Color: B: Black b: White
Coat Texture: R: Rough r: Smooth

11. Phenotypic Ratio= 9:3:3:1 BR bR br Br
BBRR
BbRR
BbRr
BBRr
BBrr
Bbrr
bbRR
bbRr
bbrr
How many of the offspring would have black, rough coat?
How many of the offspring would have a black, smooth coat?
How many of the offspring would have a white, rough coat?
How many of the offspring would have a white, smooth coat?
Phenotypic Ratio=
9:3:3:1
Fur Color: B: Black b: White
Coat Texture: R: Rough r: Smooth

12. Fractions Method BbRr x BbRr Bb Bb Rr Rr
Step 1: Split the traits for mom and dad
MOM
DAD
BbRr x BbRr Bb Bb Rr Rr

13. Step 2: Create 2 punnett squares for the traits
DAD
DAD B b R r B BB Bb R RR Rr b Bb r Rr rr bb
MOM
MOM
Step 3: Fill in the punnett squares

14. Step 4: Solve problems by multiplying fractions
DAD
Fur Color: B: Black b: White
DAD B b R r B BB Bb R RR Rr
Coat Texture: R: Rough r: Smooth b Bb rr bb Rr r
MOM
MOM
How many of the offspring would have a black, rough coat? 3 3 9 X = 4 4 16

15. Step 4: Solve problems by multiplying fractions
DAD
Fur Color: B: Black b: White
DAD B b R r B BB Bb R RR Rr
Coat Texture: R: Rough r: Smooth b Bb rr bb Rr r
MOM
MOM
How many of the offspring would have a black, smooth coat? 3 1 3 X = 4 4 16

16. Step 4: Solve problems by multiplying fractions
DAD
Fur Color: B: Black b: White
DAD B b R r B BB Bb R RR Rr
Coat Texture: R: Rough r: Smooth b Bb rr bb Rr r
MOM
MOM
How many of the offspring would have a white, rough coat? 1 3 3 X = 4 4 16

17. Step 4: Solve problems by multiplying fractions
DAD
Fur Color: B: Black b: White
DAD B b R r B BB Bb R RR Rr
Coat Texture: R: Rough r: Smooth b Bb rr bb Rr r
MOM
MOM
How many of the offspring would have a white, smooth coat? 1 1 1 X = 4 4 16

18. Hybrid= Heterozygous Purebred= Homozygous

19. 1. *Hybrid*
2. *Purebred*
What is the probability that the baby Reebop will have 2 antennae and 3 body segments?

20. A a B b A AA Aa b Bb bb AA Aa A b Bb bb 4 2 8 = X 4 4 16
What is the probability that the baby Reebop will have 2 antennae and 3 body segments?
1. *Hybrid*
2.*Purebred* A a B b A AA Aa b Bb bb AA Aa A b Bb bb 4 2 8 = X 4 4 16

21. Genotype / phenotype code
1. *Hybrid*
2. Hybrid eyes
Characteristic
Genotype / phenotype code
eyes
EE = 2 eyes
Ee = 2 eyes
ee = one eye
humps
HH = 1 hump
Hh = 1 hump
hh = 3 humps
What is the probability that the baby Reebop will have 2 eyes and 3 humps?

22. Genotype / phenotype code
Characteristic
Genotype / phenotype code
eyes
EE = 2 eyes
Ee = 2 eyes
ee = one eye
humps
HH = 1 hump
Hh = 1 hump
hh = 3 humps
What is the probability that the baby Reebop will have 2 eyes and 3 humps?
1. *Hybrid*
2.hybrid eyes E e H h E EE Ee h Hh hh Ee ee e h Hh hh 3 2 6 = X 4 4 16

23. In pea plants, yellow seeds (Y) are dominant over green seeds (y), and rounded peas (R) are dominant over wrinkled peas (r).
Cross a plant that is heterozygous for both traits with a plant that is homozygous recessive for both traits.
Genotypes:
YyRr and yyrr
What is the probability that the plant will be yellow and wrinkled?

24. Y y R r y Yy yy r Rr rr y Yy Rr rr yy r 2 2 4 X = 4 4 16
How many of the offspring would have a yellow, wrinkled seed? 2 2 4 X = 4
OR ¼ 4 16

25. What are the traits? What’s dominant/recessive?

26. Work on your Dihybrid practice for the rest of class
Work on your Dihybrid practice for the rest of class. We’ll finish tomorrow 

27. Trait
Dominant Gene
Recessive Gene
Body size
Small (S)
Large (s)
Snow Color
White (W)
Blue (w)
Feet
Snow feet absent (F)
Snow feet present (f)
Nose Style
Long (L)
Stubby (l)
Use the chart to identify the genotype of the following traits:
Heterozygous long nose, large body: _________
Hybrid small body, homozygous white snow body: _________
Snow feet present, stubby nose: ____________
Ll ss
Ss WW
ff ll

28. GREEN= Frosty RED= Frosty’s Hunny
Olaf’s best friend, Frosty the (large) Snowman was bragging that he’d found the most adorable snow lady to marry. Frosty loves his (hybrid) small lady’s cute snow feet and wants Olaf to figure out the chances that Frosty can hear the pitter patter of little snow feet running through the forest, even though Frosty doesn’t have any feet of his own (Ff).
GREEN= Frosty
RED= Frosty’s Hunny

29. Identify the genotypes: 4
Identify the genotypes: 4. Frosty: large body, no feet: ____________________ 5. Frosty’s fiancée: small body, feet: __________________ 6. Frosty: long nose (hybrid), white body (hybrid) _______________________ 7. fiancé: long nose (heterozygous), white body (heterozygous) ______________________ 8. What is the probability that Frosty and his fiancé will have a large baby with snow feet? (Hint: Remember to multiply your fractions)
ss Ff
Ss ff
Ll Ww
Ll Ww