Pedigree Quiz

Which members of the family above are afflicted with Huntington's Disease?

• I-1, II-2, II-3, II-7, and III-3
• I-1, I-2, II-3, II-7, and III-5
• I-1, I-3, II-8, and III-2
• I-2, II-1, II-4, II-5, II-6, II-8, III-1, III-2, III-4, and III-5

There are no carriers for Huntington's Disease- you either have it or you don't. Is Huntington's disease caused by a dominant or recessive trait?

• Dominant
• Recessive

How many children did individuals I-1 and I-2 have?

• 2
• 4
• 6
• 8

How many girls did II-1 and II-2 have?

• 1
• 2
• 3
• 4

How many of II-1 and II-2's girls have Huntington's?

• 1
• 2
• 3
• 4

How are individuals III-2 and II-4 related?

• Cousins
• Dad and Daughter
• Uncle and Niece
• Grandpa and Granddaughter

How are individuals I-2 and III-5 related?

• Grandpa and grandson
• Mom and son
• Uncle and nephew
• Grandma and grandson

How are individuals I-2 and III-5 related?

• Grandpa and grandson
• Mom and son
• Uncle and nephew
• Grandma and grandson

Is hitchhiker's thumb dominant or recessive? The carriers are not marked. Should there be carriers in this pedigree?

• Dominant
• Recessive

How are individuals III-1 and III-2 related?

• Married
• Brother and sister
• Cousins
• Aunt and nephew