1. Genetics

2. 1B5 Genetics inheritable and non-inheritable characteristics,
chromosomes
and genes

3. 1B5 Genetics
OB35
understand that humans have inheritable and non-inheritable characteristics, and that inheritable characteristics are controlled by genes
OB36
recall that genes are located on chromosomes and that in a human there are 23 pairs of chromosomes, which are located in the nucleus
OB37
recall that chromosomes are made of DNA
and protein

4. OB35 understand that humans have inheritable and non-inheritable characteristics
some characteristics are passed on from parents to children – these are called inheritable…
other characteristics are independent of parentage – these are called non-inheritable…
these characteristics may in turn be passed on to the following generation(s)…
these characteristics will not be passed on to the following generation(s)…

5. Inheritable characteristics are received from parents…
OB35 understand that humans have inheritable and non-inheritable characteristics
Inheritable characteristics are received from parents…
father mother

6. Check out some of your own inheritable characteristics…
OB35 understand that humans have inheritable and non-inheritable characteristics
Check out some of your own inheritable characteristics…
Arm fold preference
“Hitchhiker’s thumb”
Pinkie finger alignment
Ear lobe attachment

7. OB35 understand that humans have inheritable and non-inheritable characteristics
Check out your own…
Arm fold preference: fold your arms - ?Do you fold right-over-left or left-over-right?

8. ? Is it straight or curved?
OB35 understand that humans have inheritable and non-inheritable characteristics
Check out your own
“Hitchhiker’s thumb”: extend your thumb –
? Is it straight or curved?

9. ? Are they straight or curved away from each other?
OB35 understand that humans have inheritable and non-inheritable characteristics
Check out your own …
Pinkie fingers: place them side by side –
? Are they straight or curved away from each other?

10. ? Is it directly attached or separated ?
OB35 understand that humans have inheritable and non-inheritable characteristics
Check out your own …
Ear lobe: look at your ear in a mirror –
? Is it directly attached or separated ?

11. Other inheritable characteristics include:
OB35 understand that humans have inheritable and non-inheritable characteristics
Other inheritable characteristics include:
eye
colour
freckles
blood type
haemophilia
cystic fibrosis
If you are connected to the internet, some of the images will link you to a source of information

12. Some non-inheritable characteristics: Height Shoe size
OB35 understand that humans have inheritable and non-inheritable characteristics
Some non-inheritable characteristics:
Height
Shoe size

13. two genes for eye colour
OB35 understand that inheritable characteristics are controlled by genes
For each inheritable characteristic, a human has two genes – one passed on by the father’s sperm cell, the other by the mother’s egg cell
two genes for eye colour
one gene for eye colour
one gene for eye colour

14. chromosomes in the nucleus
OB36 recall that genes are located on chromosomes which are located in the nucleus
chromosomes in the nucleus

15. OB36 recall that genes are located on chromosomes which are located in the nucleus
image from

16. OB36 recall that in a human there are 23 pairs of chromosomes, which are located in the nucleus
©news.bbc.co.uk

17. OB37 recall that chromosomes are made of DNA and protein
DNA stands for deoxyribonucleic acid
it is a molecule built in a particular code
the code contains instructions for every structure and function the body will ever need
the DNA code for each separate structure or function is called a gene
this makes it a very very long molecule…so how does it fit into a very tiny nucleus?

18. OB37 recall that chromosomes are made of DNA and protein
© 2005 Chugoku Rosai Hospital
the long DNA molecule is so twisted and coiled so that it takes up tiny little space…
each twisted coil of DNA, containing many genes, makes one chromosome…
small molecules of protein help keep the chromosome in shape

19. OB37 recall that chromosomes are made of DNA and protein
the code in DNA is different in every human being…(except for ?????)
Each individual’s unique code is called their DNA fingerprint
because of this, DNA is used in
crime scene investigation
parental disputes

20. OB37 recall that chromosomes are made of DNA and protein
the code in DNA is different in every human being…except for ?????
IDENTICAL TWINS
can you explain why

21. OB37 recall that chromosomes are made of DNA and protein
How small is DNA? If you are connected to the internet, click on the image below to get an idea

22. Genetics
OB35
understand that humans have inheritable and non-inheritable characteristics, and that inheritable characteristics are controlled by genes
OB36
recall that genes are located on chromosomes and that in a human there are 23 pairs of chromosomes, which are located in the nucleus
OB37
recall that chromosomes are made of DNA
and protein