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Lesson Sequence
1. 2. 3. 4. Genetic Crosses5.6.7.8. 9. 10.
Resources needed:• Genetic crosses Harry Potter worksheet. (1
per student)
• Info sheet for teacher
• Req: none
PLTS icons if needed
Genetic crosses
Friday 21 April 2023
Level Objective Outcome
E/D Explain how recessive and dominant genes interact
Complete the starter successfully
C/B Interpret and draw punnet squares and family trees.
Complete of 1 & 2 of Harry Potter tasks. Slides 19- 23
A-A*
Consider the ethical issues of genetic counselling.
Answer question on slide 31 and page
Keywords
Dominant, recessive, punnet square, family tree.
carrier
Starter: Charlie has Hazel eyes. Her parents both have blue eyes. Draw a diagram to EXPLAIN how this can be
Extension:
viernes, 21 de abril de 2023
vendredi 21 avril 2023
Explain why you have some features that are similar to your siblings. Use the word allele in your answer.
Genetic crosses
Friday 21 April 2023
Keywords
Dominant, recessive, punnet square, family tree.
carrierExtension:
viernes, 21 de abril de 2023
vendredi 21 avril 2023
Explain why you have some features that are similar to your siblings. Use the word allele in your answer.
We need some definitions: match the correct word to the definition:
Dominant Carrier Recessive Genotype Phenotype
RRRr rrWhat you look like
Your genetic make up
Genetic crosses
Friday 21 April 2023
Keywords
Dominant, recessive, punnet square, family tree.
carrierExtension:
viernes, 21 de abril de 2023
vendredi 21 avril 2023
Explain why you have some features that are similar to your siblings. Use the word allele in your answer.
We need some definitions: match the correct word to the definition:
Dominant Carrier Recessive Genotype Phenotype
RR Rr rrWhat you look like
Your genetic make up
Genetic crosses
Friday 21 April 2023
Keywords
Dominant, recessive, punnet square, family tree.
carrierExtension:
viernes, 21 de abril de 2023
vendredi 21 avril 2023
Explain why you have some features that are similar to your siblings. Use the word allele in your answer.
Naked Scientist animation! (from interactive book)
How are characteristics inherited?
I don’t understandwhy she is a
Witch if her parentsare muggles?
I don’t understandwhy she is a
Witch if her parentsare muggles?
No wonder, Malfoy!You didn’t pay attention in
my genetics lessons!!!
Inheritance of characteristics
I still don’t understandwhy she is a witch…
I still don’t understandwhy she is a witch…
But it’s easy!!!Let me explain
some Wizard Geneticsto you
How are Wizards made?How are Wizards made?It’s all
in their genes!!!!It’s all
in their genes!!!!The allele for
being a Wizard is m
The allele for being a muggle is M
The allele for being a muggle is M
Being a muggle
is dominant
over being
a Wizard…..
Being a muggle
is dominant
over being
a Wizard…..
Like muggles,Wizards inherit
one allele from their mum,and one allele from their dad
Like muggles,Wizards inherit
one allele from their mum,and one allele from their dad
Let’s do someWizard genetics…
Let’s do someWizard genetics…
Wizards and muggles…
The allele for being a Wizard is ………
The allele for being a muggle is ………
Being a muggle is ………………………over being a Wizard
Let’s do someWizard genetics…
Let’s do someWizard genetics…
Answer the questions on Wizard geneticson your worksheets....
Wizards and muggles…
Let’s do someWizard genetics…
Let’s do someWizard genetics…
The PottersThe Potters
- What alleles do Harry’s parents have?- What were the chances of Harry being a Wizard?
Harry’sgrandparents
Harry’sgrandparents
Lily Potter
Petunia Dursley
Harry’s grandmother
Harry’sgranddad
- What alleles do Lily’s parents have?- What were the chances of Lily being a witch?- What were the chances of Petunia being a muggle?- What are the chances that Petunia is a “carrier”?
The DursleysThe Dursleys
Petunia
Vernon
Even if Petunia was a carrier of the Wizardingallele, is there any chance at all that Dudley wasa Wizard?What are his odds at best (given his father is not aWizard?
The MalfoysThe Malfoys
The GrangersThe Grangers Why is Hermione a witch?
What were the chances?
Tom RiddleTom Riddle
Tom Riddle was a half-blood.His mother was a witch and his father was a muggle.
What alleles did his parents have?What were the chances that Tom Riddle was a wizard?
Hermione+
Ron
Will their children definitively be Wizards and Witches?
Argus Filch is a squib. His parents were Wizards,but doesn’t really have any wizarding abilities.Suggest an explanation.
FilchFilch
Speaking Parseltongue is a rare feature in the Wizarding world. Only descendents from Slytherin might have this ability.Harry speaks Parseltongue, but Ginny doesn’t and neither did Harry’s parents.
Suggest if the allele for speaking Parseltongue is dominant or recessive:
What are the chances that Harry’s and Ginny’s children speak Parseltongue if (a) Ginny isn’t a carrier and (b) if Ginny does carry the allele?
Harry+ GinnyHarry
+ Ginny
(a) (b)
(c) Actually, Harry didn’t inherit the two recessive Parseltongue alleles, but they were transferred to his DNA when Voldemort tried to kill him.
What is the scientific name for this process?
Harry +Voldemort
Harry +Voldemort
(a) Being werewolf (W) is dominant over not being a werewolf (w). Remus Lupin is a werewolf (Ww), but his wife , Nymphadora Tonks, is not.
What are the chances that their son is a werewolf?
RemusRemus
(b) Both Remus and Nymphadora also carry the allele for speaking Parseltongue. What are the chances that their son is a werewolf
who speaks Parseltongue?
RemusRemus
Genetic crosses
Level Objective Outcome
E/D Explain how recessive and dominant genes interact
Complete the starter successfully
C/B Interpret and draw punnet squares and family trees.
Complete of 1 & 2 of Harry Potter tasks. Slides 19- 23
A-A*
Consider the ethical issues of genetic counselling.
Answer question on slide 31 and page
MID-LESSON PROGRESS CHECKSwap work with the person next to you.
Are they on track to meet their target?
Family trees
Family tree
• Family tree genetic diagrams are used by doctors to provide genetic counselling for couples with genetic disorders prior to pregnancy.
Q. Explain why they are useful and what ethical considerations such counselling might raise.
Plenary: What have you learnt today?
Next lesson: Inherited Disorders 5 mins
Plenary task
Level Objective Outcome
E/D Explain how recessive and dominant genes interact
Complete the starter successfully
C/B Interpret and draw punnet squares and family trees.
Complete of 1 & 2 of Harry Potter tasks. Slides 19- 23
A-A*
Consider the ethical issues of genetic counselling.
Answer question on slide 31 and page
Write one thing you know well this lesson and one thing you need to improve on.