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.