HAPPY THURSDAY!!! 1.Turn in your SpongeBob worksheet. (finished or not) 2.In your Journals, begin answering the questions that are on your desk. 3.Wait patiently for me to start class.

Long eyelashes (E) are dominant to short eyelashes (e). 1. What is the trait in this scenario? 2.What are the two alleles in this scenario? 3.A woman is homozygous recessive. What is her genotype? 4.A man is homozygous dominant. What is his phenotype? 5.A man is heterozygous for eyelashes. What is his genotype. 6.A woman’s genotype is Ee. What is her phenotype? 7.A cross occurs between a homozygous recessive male and a heterozygous woman…. – What are the chances of their first child having long eyelashes? – What are the chances of their 8 th child having long eyelashes? HINT…DRAW A PUNNETT SQUARE!

Long eyelashes (E) are dominant to short eyelashes (e). 1.What is the trait in this scenario? Eyelash Length

Long eyelashes (E) are dominant to short eyelashes (e). E & e OR Long and short eyelashes 2. What are the two alleles in this scenario?

Long eyelashes (E) are dominant to short eyelashes (e). 3. A woman is homozygous recessive. What is her genotype? ee

Long eyelashes (E) are dominant to short eyelashes (e). 4.A man is homozygous dominant. What is his phenotype? Long eyelashes

Long eyelashes (E) are dominant to short eyelashes (e). 5.A man is heterozygous for eyelashes. What is his genotype? Ee

Long eyelashes (E) are dominant to short eyelashes (e). 6.A woman’s genotype is Ee. What is her phenotype? Long Eyelashes

Long eyelashes (E) are dominant to short eyelashes (e). 7.A cross occurs between a homozygous recessive male and a heterozygous woman…. Male – ee Female – Ee

Long eyelashes (E) are dominant to short eyelashes (e). 7. A cross occurs between a homozygous recessive male and a heterozygous woman…. Ee ee ee E e

Long eyelashes (E) are dominant to short eyelashes (e). – What are the chances of their first child having long eyelashes? – What are the chances of their 8 th child having long eyelashes? 2 out of 4

Walk Around Review Goal: Answer as many questions as you can in the time permitted. MONO VS Dihybrid… Two methods of answering… FOIL/Dance or Fraction

1. Mating a black mouse with a brown mouse over several generations produced 14 brown mice and 16 black mice. If black is dominant and brown is recessive, what are the genotypes of the parent mice? A BB x bb B BB X Bb C Bb X Bb D Bb X bb *Show proof of your answer (Punnett Square)

1. Mating a black mouse with a brown mouse over several generations produced 14 brown mice and 16 black mice. If black is dominant and brown is recessive, what are the genotypes of the parent mice? A BB x bb B BB X Bb C Bb X Bb D Bb X bb *Show proof of your answer (Punnett Square) Bbbb Bbbb B b b b

2) Using the dihybrid cross below, what would the phenotypic ratio be if two pea plants with a genotype of RrYy were crossed? A 6:3:3:3 B 12:4 C 9:3:3:1 D 6:10

2) Using the dihybrid cross below, what would the phenotypic ratio be if two pea plants with a genotype of RrYy were crossed? A 6:3:3:3 B 12:4 C 9:3:3:1 D 6:10

3) If several pea plants with the genotype TTYy are crossed with pea plants with the genotype Ttyy, what percentage of the offspring will be expected to have the TTYy allele combination? A 25% B 40% C 50% D 75% *Show proof of your answer (Punnett Square(s))

We have to FOIL: TTYy: TY, Ty, TY, Ty Ttyy: Ty, Ty, ty, ty 3) If several pea plants with the genotype TTYy are crossed with pea plants with the genotype Ttyy, what percentage of the offspring will be expected to have the TTYy allele combination? TY ty Ty TTYy TTyy TTYyTTyyTTYyTTyy TtYyTtyyTtYyTtyy TtYyTtyy TTyy TtYy

3) If several pea plants with the genotype TTYy are crossed with pea plants with the genotype Ttyy, what percentage of the offspring will be expected to have the TTYy allele combination? A 25% B 40% C 50% D 75% *Show proof of your answer (Punnett Square(s)) TT Tt Yyyy Yyyy T T T t Y y y y ½ x ½ = ¼ or 25%

*Show proof of your answer (Punnett Square(s)) 4) In cocker spaniels the allele for a black coat color (B) is dominant over the allele for a brown coat color (b). If a brown cocker spaniel is crossed with a heterozygous black cocker spaniel, what genotypic ratio can be expected?

*Show proof of your answer (Punnett Square(s)) 4) In cocker spaniels the allele for a black coat color (B) is dominant over the allele for a brown coat color (b). If a brown cocker spaniel is crossed with a heterozygous black cocker spaniel, what genotypic ratio can be expected? Bb bb Look at “genotypes” 2Bb : 2bb b b B b

5. What percentage of the offspring from a BbFf x bbff cross would be expected to be heterozygous for both traits? *Show Proof of your answer (Punnett Square(s))

5. What percentage of the offspring from a BbFf x bbff cross would be expected to be heterozygous for both traits? *Show Proof of your answer (Punnett Square(s)) Bbbb Bbbb Ff ff Ff ff 25% B b b b Ff f f ½ x ½ = ¼ or 25%

Complete the cross in the Punnett Square and determine the following: Genotypic Ratio:__________________________ Phenotypic Ratio:_________________________ 6.

TTTt tt Complete the cross in the Punnett Square and determine the following: Genotypic Ratio:___1TT : 2Tt : 1tt Phenotypic Ratio:__3Tall : 1 Short 6.

Complete the cross in the Punnett Square and determine the following: Genotypic Ratio:__________________________ Phenotypic Ratio:_________________________ 7.

Rr rr Complete the cross in the Punnett Square and determine the following: Genotypic Ratio:_____2Rr : 2rr Phenotypic Ratio:_____2Rough: 2:Smooth 7.

8. Whenever a capital letter is present, a red color is produced. In a cross of AaBb x AaBb, how many red offspring would you expect out of 16? a. 1 b. 3 c. 9 d. 15 * Show proof of your work (Punnett Square(s))

8. Whenever a capital letter is present, a red color is produced. In a cross of AaBb x AaBb, how many red offspring would you expect out of 16? a. 1 b. 3 c. 9 d. 15 * Show proof of your work (Punnett Square(s)) AAAa aa BBBb bb Aa a A B b b B ¾ x ¾ = 9/16

9. If W = purple flower and w = white, and D = tall plants and d = short plants, a wwDd plant would be… a. purple and tall b. purple and short c. white and tall d. white and short

9. If W = purple flower and w = white, and D = tall plants and d = short plants, a wwDd plant would be… a. purple and tall b. purple and short c. white and tall d. white and short

10. If two purebreed parents are crossed with each other and all the offspring have their mother's ears and their father's tail, the parents in the cross would be a. EETT x eett b. eeTT x EEtt c. EeTt x EeTt d. eeTt x Eett *Hint…think about who goes where (male vs female) on a Punnett square and what the E’s and the T’s must stand for

10. If two purebreed parents are crossed with each other and all the offspring have their mother's ears and their father's tail, the parents in the cross would be a. EETT x eett b. eeTT x EEtt c. EeTt x EeTt d. eeTt x Eett *Hint…think about who goes where (male vs female) on a Punnett square and what the E’s and the T’s must stand for

11. If aaBb is crossed with AAbb, what are the chances that the offspring will be AAbb? a. 0 b. 3/16 c. 9/16 d. 1/4 *Show proof of your work (Punnett Square(s))

11. If aaBb is crossed with AAbb, what are the chances that the offspring will be AAbb? a. 0 b. 3/16 c. 9/16 d. 1/4 *Show proof of your work (Punnett Square(s))

12. If AaBb is crossed with aabb, what proportion of the offspring would be expected to be aabb? a. 9/16 b. 1/8 c. 1/4 d. 1/16 *Show proof of your work (Punnett Square(s))

12. If AaBb is crossed with aabb, what proportion of the offspring would be expected to be aabb? a. 9/16 b. 1/8 c. 1/4 d. 1/16 *Show proof of your work (Punnett Square(s))