1.  Pedigree charts BY: EMILY, SAM AND KAY

2. Definition  Pedigree charts plot the generations of a family and can be used to trace a genetic disease.

3. What is a Pedigree chart?  Pedigree charts show a record of the family of an individual  They can be used to study the transmission of a hereditary condition  They are particularly useful when there are large families and a good family record over several generations.

4. Drawing the Pedigree Chart

5. gametes Dd DDDDd d dd A B A B Disease caused by a dominant (D) allele look for two affected parents producing a normal individual Chris Paine https://bioknowledgy.wikispaces.com/

6. Disease caused by a recessive (d) allele In recessive diseases affected individuals often occur every other generation Chris Paine https://bioknowledgy.wikispaces.com/