Fifth Pedigree

The following pedigree presents you with the inheritance pattern of a trait within a family. Use the interrelationships between the affected family members to determine what type of inheritance is followed by this trait.

Please determine the genotypes of family members, and choose the option which best describes the inheritance pattern of the highlighted trait (magenta color) in the above family pedigree.

1. Autosomal Dominant Inheritance
2. Mitochondrial Inheritance - Please note that unaffected mothers have affected children in this family (grey arrows). Also, not all children of an affected mother express the trait (blue arrows). Mitochondrial inheritance is maternal: all children of an affected mother are affected, and the affected children's mother is affected as well. Please RETURN to the Fifth Pedigree assessment.
3. X-linked Inheritance
4. Y-linked Inheritance