1. Warm Up Use the following terms to label each genotype- homozygous dominant, homozygous recessive, heterozygous, pure, hybrid 1.LL 2.Bb 3.Rr 4.Dd 5.mm 6.What is the difference between a genotype and a phenotype? 7.What is the difference between a dominant trait and a recessive one?

4. YY yellow

6. Punnett Squares Pg. ___

7. Today’s Learning Target  I can use a Punnett Square to determine the probability of having certain offspring.  I can explain why one gene will not have an effect on another gene when being passed on to offspring

8. Punnett Squares 1. Use a letter to represent alleles. a. Dominant allele = capital letter (B) b. Recessive allele =same letter but lowercase (b)

9. Punnett Squares 1. Use a letter to represent alleles. a. Dominant allele = capital letter (B) b. Recessive allele =same letter but lowercase (b) 2. Define your alleles B = Black / b = white

10. Punnett Squares 1. Use a letter to represent alleles. a. Dominant allele = capital letter (B) b. Recessive allele =same letter but lowercase (b) 2. Define your alleles B = black fur / b = white fur 3. Determine the parents’ genotypes

11. Genotype Symbol Genotype Vocabulary Phenotype BB Bb bb Homozygous (pure) DOMINANT heterozygous hybrid carrier Homozygous (pure) RECESSIVE Black white

12. Punnett Squares 4. Draw a square and divide into 4 boxes

13. Punnett Squares 4. Draw a square and divide into 4 boxes 5. Fill in genotypes of parents (1 letter at top of each box) a. Parent #1 on top of box b. Parent #2 on side of box

14. Punnett Squares 4. Draw a square and divide into 4 boxes 5. Fill in genotypes of parents (1 letter at top of each box) a. Parent #1 on top of box b. Parent #2 on side of box 6.Fill in your boxes by dragging the letters (Two letters per box)

15. Ex: Black fur is dominant over white fur 1. Letter B 2. B = Blackb = White Use Steps to Make a Punnett Square

16. Black fur is dominant over white fur 1. B = Blackb = White 2. Define your alleles 2. (dominant allele) (recessive allele) Steps to Make a Punnett Square

17. Black fur is dominant over white fur 1. B = Blackb = White 3. Cross a homozygous black fur with white fur Parent 1 = BBParent 2 = bb Steps to Make a Punnett Square

18. Steps to Make a Punnett Square 4. Draw a square and divide into 4 boxes Parent 1 = Parent 2 = BB BB b bb b

19. Steps to Make a Punnett Square Parent 1 = Parent 2 = BBB B b bb b

20. Steps to Make a Punnett Square 5. Fill in the genotypes of the parents (1 letter on top of each box) Parent 1 = Parent 2 = BB B B b b b b B B B B bb bb All Black Fur

21. Steps to Make a Punnett Square 6. Fill in the letters by dragging 2 into each box Parent 1 = Parent 2 = Bb B b B b B b BB Bb bb

22. B = Black fur b = White fur BB BB b b Bb bb

23. F = Free f = Attached Ff F f F f FF Ff ff Ff

24. T = Tall t = Short tt t t T T Tt TT

25. S = Smooth s = Wrinkled ss ss S s Ss ss Ss ss Ss

26. S = Smooth s = Wrinkled Ss Ss S s SS Ss ss Ss

27. T = tall t = short Tt Tt T T TT Tt TT 2:2:0 4:0

28. T = tall t = short Tt Tt T t TT Tt tt Tt 1:2:1 3:1