1. What does pedigree mean?X
What does pedigree mean?
Pedigree: a diagram that traces one trait through several generations of a family

2. Pedigree Video *Only for those who can’t watch it on Haiku*

3. = female
= male

4. Example #1 How many girls? ___ How many boys? ___ mom dad son
daughter #1
daughter #2

5. mom
dad
oldest
youngest
daughter #1
daughter #2
son

6. A horizontal line connecting two shapes represents a cross/marriage.
mom
dad

7. Example #2
How many crosses/marriages? A B C D E F G

8. A vertical line extending down from a marriage/cross represents that the couple has children.
mom
dad

9. Carrier When a person is half shaded it means they are a carrier.
=A male who is affected by trait
= A female who is affected by a trait
Carrier: A person that carries ONE copy of the gene, but it is masked by the dominant trait. (hybrid).

10. How do you show that a person has the trait?
Shading
( shaded = recessive ) RR Rr rr
mutation
**A pedigree chart follows one trait.

11. Pedigree Symbols Symbol Meaning Normal Female Normal Male
Affected Female
Affected Male
Carrier Female
Carrier Male
Marriage
Reproduced (Had Offspring)

12. A B C D E F
questions… G

13. ? Example #3 How many couples have children? H A B G H C D E F J K L MQ R S T

14. Pedigree charts help to trace genetic traits such as diseases
Pedigree charts help to trace genetic traits such as diseases. Most genetic diseases are a recessive gene.
If you have 1 recessive, you are a carrier, but you are not sick.
If you have 2 recessive genes, you are sick with the disease. (you are “affected”)
In order for a trait to be dominant it has to show up in EVERY generation. Aa aa

15. How do you show twins? A B C D E F

16. Rr
mom RR
dad
R = tongue roller
r = non-roller
__ __
son
__ __
Daughter 1
__ __
Daughter 2
R R R r RR RR Rr Rr