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**Let’s Review- Harry Potter Genetics**

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Question 1 Harry has dark brown hair like his father, but his mom had red hair. Using the genotypes of B and b, what possible genotypes does each of the Potters have? The phenotypes of the Potters are: James Potter- Lily Potter- Harry Potter-

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**Mom could be bb Dad could be BB or Bb**

Using the genotypes of BB, Bb, bb, what are possible genotypes for Harry’s parents? Mom could be (she has red hair) Dad could be (he has dark brown hair) Mom could be bb Dad could be BB or Bb

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**Given the punnet squares for the parents, the only possible genotype for Harry is Bb**

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**Question 2: Harry marries Ginny who has red hair**

Question 2: Harry marries Ginny who has red hair. What are the possible Genotypes of their children’s hair?

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**First: what are the genotypes for Harry and Ginny’s hair color?**

Harry is: Bb Ginny is: bb

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**Given the genotypes of Bb and bb, we can fill in the Punnet Square**

Bb Bb bb bb Their children have a 50% chance of having red hair or brown hair

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**How can Harry help us learn about Dihybrid Squares?**

Dihybrid squares are punnet squares that look to compare 2 traits and see how they could be inherited

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Keep in mind that the traits do not have to be inherited together Remember the Law of Independent Assortment Just because Harry has brown hair does not mean he will have magic Just because Ginny has red hair doesn’t mean that she will magic

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**So let’s look at the possible genes for their children!**

They have 3: Lily Luna, James Sirius and Albus Severus

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**Let’s review the genes for Muggles , Magic, Brown hair and Red hair**

M= muggleness m= magic ability B = brown hair b= red hair

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**We have already determined the phenotypes for Harry and Ginny**

Harry is mm for magic and Bb for brown hair… or mmBb Ginny is mm for magic and bb for red hair….or mmbb

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**Factor out the possibilities mmBb mB**

To figure out what their kids could look like, we must do a dihybrid cross Harry is mmBb Factor out the possibilities mmBb mB Harry can give off the following traits: 1. Take the little m and put it with the B (this is one possibility)

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**Factor out the possibilities mmBb mB mb**

To figure out what their kids could look like, we must do a dihybrid cross Harry is mmBb Factor out the possibilities mmBb mB mb Harry can give off the following traits: Take the little m and put it with the B (this is one possibility) Take the little m and put it with the little b

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**Factor out the possibilities mmBb mB mb mB**

To figure out what their kids could look like, we must do a dihybrid cross Harry is mmBb Factor out the possibilities mmBb mB mb mB Harry can give off the following traits: Take the little m and put it with the B (this is one possibility) Take the little m and put it with the little b Go to the second little m and put it with B

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**Factor out the possibilities mmBb mB mb mB mb**

To figure out what their kids could look like, we must do a dihybrid cross Harry is mmBb Factor out the possibilities mmBb mB mb mB mb Harry can give off the following traits: Take the little m and put it with the B (this is one possibility) Take the little m and put it with the little b Go to the second little m and put it with B Finally take the m and put it with the b We do this because we must “factor” all the possibilities

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**Factor out the possibilities mmbb mb**

To figure out what their kids could look like, we must do a dihybrid cross Ginny is mmbb Factor out the possibilities mmbb mb Ginny can give off the following traits: 1. Take the little m and put it with the b (this is one possibility)

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**Factor out the possibilities mmbb mb mb mb mb**

To figure out what their kids could look like, we must do a dihybrid cross Ginny is mmbb Factor out the possibilities mmbb mb mb mb mb Ginny can give off the following traits: Take the little m and put it with the b (this is one possibility) Take the little m and put it with the little b Go to the second little m and put it with b Finally take the m and put it with the b. Ginny can only give recessive genes

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**Now let’s add a Punnet square**

Now let’s add a Punnet square! This one must be 16 squares to account for every possibility

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**If Harry had mB, mb, mB, mb to give we must place it at the top to account for his genes**

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**If Ginny had mb, mb, mb, mb to give we must place it on the sides to account for her genes**

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**Now let’s factor all these together!**

mB mb mB mb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb m

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**Now we need to determine the % of phenotypes**

Go back to the squares and count all the possible phenotypes: We know that the following possibilities could occur: No magic, brown hair No magic, red hair Magic, brown hair Magic, red hair

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**mB mb mB mb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb**

To have no magic, there must be at least ONE big M! Are there any here? mB mb mB mb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb m

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**NOPE!!!!!! mB mb mB mb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb**

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**So our only possibilities are magic and brown hair and magic and red hair**

mB mb mB mb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb m

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**To have Brown hair, there must be at least one B! How many are here?**

mB mb mB mb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb m

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**There are 8 Magic and Brown hair**

mB mb mB mb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb m

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**To have red hair, there must be 2 little b’s! How many are here?**

mB mb mB mb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb m

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**There are 8 magic and red hair**

mB mb mB mb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb m

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**So phenotypically Harry and Ginny would have possibilites of :**

8 magic and brown haired kids And 8 magic and red haired kids Or we could say a 50% chance of each

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**Now we need to determine the % of genotypes**

Go back to the squares and count all the possible genotypes:

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**mB mb mB mb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb**

Start with the first box: the genotype is mmBb. How many do you see in the whole square? mB mb mB mb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb m

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**mB mb mB mb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb**

8 of them are mmBb!! mB mb mB mb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb m

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**How many of them are mmbb?**

mB mb mB mb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb mb mmBb mmbb mmBb mmbb m

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**There are 8 mmbb mB mb mB mb mb mmBb mmbb mmBb mmbb**

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**So genotypically Harry and Ginny would have possibilities of :**

8 mmBb And 8 mmbb Or we could say a 50% chance of each

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**With Harry Potter of course!!!!**

Now let’s Practice!!!! With Harry Potter of course!!!!

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**Question 1: Hermione and Ron marry and have 2 kids (Rose and Hugo)**

Question 1: Hermione and Ron marry and have 2 kids (Rose and Hugo). What are the chances that their kids have magic and red hair?

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**As determined before, what are Ron’s and Hermione’s phenotypes?**

Ron is magic and red hair Hermione is magic and red hair

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**Ron and Hermione are pure recessive, so they have the same genotype: mmbb**

mb mb mb mb mb

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**Now let’s factor all these together!**

mb mb mb mb mb mmbb mmbb mmbb mmbb mb mmbb mmbb mmbb mmbb mb mmbb mmbb mmbb mmbb mb mmbb mmbb mmbb mmbb m

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**So Ron and Hermione kids, based on the Punnet square**

100% will have magic and be red haired!

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**Question 2: Hermione gets put under a spell and marries Dudley**

Question 2: Hermione gets put under a spell and marries Dudley. What are the chances their kids will have magic and red hair?

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**We already know the following about Hermione:**

She has red hair so she must be bb She can do magic so she must be mm

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**Now Dudley is a different story:**

We know that he has Brown hair so he could be BB or Bb We know that he can not do magic so he is either MM or Mm

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**So let’s use MMBB first for Dudley and Hermione is mmbb**

MB MB MB MB mb MmBb MmBb MmBb MmBb mb MmBb MmBb MmBb MmBb mb MmBb MmBb MmBb MmBb mb MmBb MmBb MmBb MmBb m

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**So 100% of their kids would be**

Muggles with Brown hair Or MmBb

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**Now let’s use MmBb for Dudley and Hermione is mmbb**

MB Mb mB mb mb MmBb Mmbb mmBb mmbb mb MmBb Mmbb mmBb mmbb mb MmBb Mmbb mmBb mmbb mb MmBb Mmbb mmBb mmbb m

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**In this case, the kids would be**

25% Muggle with brown hair (MmBb) 25% Muggle with red hair 25% Magic with brown hair 25% Magic with red hair (mmbb)

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Genetics b the study of heredity b Heredity-the way in which traits of parents are passed on to offspring.

Genetics b the study of heredity b Heredity-the way in which traits of parents are passed on to offspring.

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