1. How are we different?

2. Make the humans look different

3. Make the bodies of these people look different

4. Make the dogs look different

6. We call this difference Variation
Differences can be
Inherited or genetic (these are controlled by the genes made of DNA)
Environmental (caused by what happens to you or your environment)

7. Genetic differences

8. Some differences are not due to the genes
Some differences are not due to the genes. These are environmental differences and things like your upbringing, your diet and what you do can control these

9. Genetics and the Simpsons

10. Marge
Homer
Bart
Lisa
Maggie

11. How are the Simpsons related to each other?
married
children

12. Jackie
Mr Bouvier
Mona
Abe ?
Herb Powell
Patty & Selma

13. Let’s look at the Bouviers: They all have unusual coloured hair.
Is this inherited?
Possibly.
We would need more information to be sure.
They all also have a forward-sloping posture. This is probably inherited.
Marge and Jackie have similar hairstyles. This is probably not inherited.
Jackie
Mr Bouvier
Patty & Selma
Marge

14. What about the Simpsons?
Mona, Homer, and Herb Powell all have very similar eyes. This is most likely to be inherited.
Although Abe is old, he, Homer, and Herb share very similar face shapes. This is probably inherited.
Abe and Homer appear to be overweight. Mona and Herb are not, so this is probably caused by environmental factors.
Mona
Abe
Herb Powell
Homer

15. The Simpson Children
Which characteristics do the children share with their parents?
All three children have the same ear shape as Homer. This is an inherited characteristic.
Marge, Bart, and Lisa all have a similar shaped mouth, which is likely to be an inherited characteristic.
Lisa is very intelligent and good at schoolwork. Bart is less intelligent, and often in trouble at school.
Bart probably inherits his personality from Homer, and Lisa inherits these characteristics from Marge.

16. The Simpson Children
All three children have spiky yellow hair. Where is this inherited from?
Not Marge.
What about Homer?
Don’t know, because he is bald.
BUT, look at Grandpa Simpson:

17. This is Abbie, Homer’s half-sister.
This is Cyrus Simpson. Abe’s brother.
This is Gladys Bouvier. She is Marge and Patty & Selma’s aunt