1. Agenda 4/1 Pedigree Lecture Pedigree Practice Hemophilia Case Study
Turn in: POGIL answers
Homework
1. Finish Case Study
2. Hardy-Weinberg Practice

2. Is a widow’s peak a dominant or recessive trait? b)
Key
Male
Female
Affected male
Affected female
Mating
Offspring
1st generation Ff Ff ff Ff
1st generation Ww ww ww Ww
2nd generation
2nd generation
FF or Ff ff ff Ff Ff ff Ww ww ww Ww Ww ww
3rd generation
3rd generation ff
FF or Ff
WW or Ww ww
A valuable tool in studying inheritance patterns is a pedigree. A pedigree is a family tree that describes the interrelationships of parents and children across generations
Inheritance patterns of particular traits can be traced and described using pedigrees
Widow’s peak
No widow’s peak
Attached earlobe
Free earlobe
(a)
Is a widow’s peak a dominant or recessive trait? b)
Is an attached earlobe a dominant or recessive trait?

3. Pedigree Symbols

4. Pedigree #1

5. Pedigree #1

6. Pedigree #1

7. Pedigree #1 Characteristics of a dominant pedigree:
1) Every affected individual has at least one affected parent
2) Affected individuals who mate with unaffected individuals have a 50% chance of transmitting the trait to each child; and
3) Two affected individuals may have unaffected children.

8. Pedigree #2

9. Pedigree #2

10. Pedigree #2

11. Pedigree #2 Characteristics of recessive pedigrees:
1) An individual who is affected may have parents who are not affected
2) All the children of two affected individuals are affected
3) In pedigrees involving rare traits, the unaffected parents of an affected individual may be related to each other.

12. Pedigree #3

13. Pedigree #3

14. Pedigree #3

15. Pedigree #3 Characteristics of sex-linked pedigrees
All females from the affected male have the trait, but not all males from affected females (dominant)
All males from the affected female have the trait, but not all females from affected males (recessive)

16. Label the genotypes and identify type of inheritance