1. Tracing Traits
Pedigrees

2. Pedigree
A visual tool for following a trait through generations of a family

3. Why would we use a Pedigree?
Pedigrees help to trace genetic diseases
For example: Cystic Fibrosis
This genetic disorder causes serious lung problems because of production of thickened mucus
CF is a recessive trait

4. Reading a Pedigree
Pedigrees are like maps, so you need to understand the symbol
represents FEMALE
represents MALE
unfilled represents NOT AFFECTED
filled represents AFFECTED
half filled represents CARRIER

5. Reading a Pedigree
Pedigrees are like maps, so you need to understand the symbol
represent married couples
represent siblings
represent offspring

6. Reading a Pedigree

7. Sex-Linked Traits An allele that is on a sex chromosome. Example:
Red/Green Colorblindness is a Recessive Sex-linked trait on the X chromosome
So what does this mean?

8. Sex-Linked Traits Dominant Sex-linked traits are rare Example:
Hereditary hypophosphatemic Rickets
Vitamin D deficiency
So what does this mean?

9. Selective Breeding
When organisms have desirable traits and are mated with another organism with desirable traits
Examples
Roses
Dogs