1. Using pedigrees to determine patterns of inheritance

2. What type of trait is shown above? A. sex-linked B. autosomal dominant C. autosomal recessive

3. How do you know this is a sex-linked trait?

4. Sex linked traits: - more common is males
Sex linked traits: - more common is males. - the son gets the trait from mom.

5. What is the clue that this is a recessive trait?

6. Recessive traits: - if both parents have it, all the children will have it. -if both parents do not have it, but a child does, the parents were hybrid

7. This disease is autosomal dominant
This disease is autosomal dominant. What is the genotype of the first generation female with the trait?

8. Cystic Fibrosis – recessive disease -caused by a mutation on chromosome 7 -causes excessive mucus to build up in the lungs -frequent pneumonia -individuals often don’t live past 40 Huntington’s disease - dominant trait -symptoms don’t begin until 30’s or 40’s -caused by a genetic defect on chromosome 4. -as the disease is passed along in families, symptoms develop at younger and younger ages. symptoms include: quick, sudden, sometimes wild jerking movements of the arms, legs, face, and other body parts, dementia