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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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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. 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 BbBb bbbb 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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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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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: 1.Take the little m and put it with the B (this is one possibility) 2.Take the little m and put it with the little b

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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: 1.Take the little m and put it with the B (this is one possibility) 2.Take the little m and put it with the little b 3.Go to the second little m and put it with B

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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: 1.Take the little m and put it with the B (this is one possibility) 2.Take the little m and put it with the little b 3.Go to the second little m and put it with B 4.Finally take the m and put it with the b We do this because we must “factor” all the possibilities

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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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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 Ginny can give off the following traits: 1.Take the little m and put it with the b (this is one possibility) 2.Take the little m and put it with the little b 3.Go to the second little m and put it with b 4.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! 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 mB mb mB mb

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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 mB mb mB mb mb

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Now let’s factor all these together! mB mb mB mb mbmmBb 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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To have no magic, there must be at least ONE big M! Are there any here? mB mb mB mb mbmmBb mmbb mmBb mmbb m

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NOPE!!!!!! mB mb mB mb mbmmBb mmbb mmBb mmbb m

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So our only possibilities are magic and brown hair and magic and red hair mB mb mB mb mbmmBb 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 mbmmBb mmbb mmBb mmbb m

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There are 8 Magic and Brown hair mB mb mB mb mbmmBb 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 mbmmBb mmbb mmBb mmbb m

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There are 8 magic and red hair mB mb mB mb mbmmBb 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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Start with the first box: the genotype is mmBb. How many do you see in the whole square? mB mb mB mb mbmmBb mmbb mmBb mmbb m

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

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How many of them are mmbb? mB mb mB mb mbmmBb mmbb mmBb mmbb m

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There are 8 mmbb mB mb mB mb mbmmBb mmbb mmBb mmbb m

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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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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). 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 mbmmbb 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. 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 mbMmBb 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 mbMmBb 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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