1. Variation and Inheritance WILF: To learn how characteristics can vary.
with…

2. The Mr Men Match.
With Mr Hemming

3. Meet our Mr Men
And our Little Misses
Now lets meet their children!

5. Who do you think are his parents? Write the answers in your book.

6. Who do you think are her parents? Write the answers in your book.

7. Who do you think are his parents? Write the answers in your book.

8. Who do you think are his parents? Write the answers in your book.

9. Who do you think are her parents? Write the answers in your book.

10. Who do you think are her parents? Write the answers in your book.

11. What did we learn from this?
Children inherit features from their parents
If two parents have a certain characteristic then their child may show it even more (e.g. Mr Small + Little Miss Tiny = Mr Very Small!)
Some things such as glasses, scars and muscles we get from our environment, they are not inherited.

12. Genetic information
The instructions that make up a plant or animal comes from their parents.
½ comes from the sperm and ½ from the egg
These instructions are found in the nucleus of the cells.
The instructions for each characteristic are called GENES.

13. We saw that when Mr Small and Little Miss Tiny produced a child it was even smaller.
What would happen if Mr Very Small had a child with Little Miss Miniscule??

14. We look like our parents because we inherit genes (DNA) from our parents.
We have an equal chance of inheriting genes from our mother and our father. This combination makes us unique.
The environment also effects our features and leads to differences = variation

15. - Tongue rolling - Hair on fingers
Even though we have many similar features we are all genetically unique ( except identical twins)

16. Colour of birds feathers
TASK: Discuss with your partner and make a list of genetic /environmental differences or both?
Normal hair colour
Eye colour
Weight
Good at maths
Height
Ability to sing
Ability to draw
Hand size
Nose shape
Foot size
Skin colour
Mouth shape
Tongue rolling
Blood type
Language you talk
Cut on hand
Personality
Length of hair
Missing tooth
Freckles
Colour of birds feathers
Your name
Your sex
Inherited diseases
Can you think of anymore?

17. Human Karyotype
23 pairs of chromosomes

18. All your cells have got the same genes and they are in the nucleus.
Each parent has two sets of genes …
3.2a Making a baby
Genes influence our appearance by controlling what our cells make and how they behave
All your cells have got the same genes and they are in the nucleus.
Genes control every characteristic we have 18

19. ... but each set of genes is split into 23 groups.
3.2a Making a baby
Toss a coin to see which group of genes your baby inherits from each parent.
heads = dark set, tails = light set
Pink= Heads 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 X
Red= tails X
Dark Blue= heads X
Light Blue= tails Y
Eg. For gene group 1
From mum = coin toss was tails so inherited light pink set
From dad = coin toss was heads so inherited dark blue set
From mum
From Dad 19

20. We can make larger animals and crops that produce more fruit.
This is called selective breeding.
Large fruited Mum
Large fruited Dad
Very large fruited child!
At this point give out picture of the giant bull.

21. Lets see what you’ve learned:
Farmer Hemming wants to breed cows that are large and meaty so that he can sell them for more.
What advice would you give him in order to produce larger cows?
2. He can’t seem to breed cows with nose rings! Why not?
3. How many chromosomes are in your cells?