Final Answer:
1. Genotypes:
- Top left square (affected male):
aa
- Top right circle (unaffected female):
Aa
- Middle left square (unaffected male):
Aa
- Middle right circle (unaffected female):
AA or
Aa (but since they have an affected child, must be
Aa)
- Bottom left square (affected male):
aa
- Bottom right circle (affected female):
aa
Number of children in this family:
4
Number of carriers (Aa):
2 (the two unaffected parents in the middle generation — the male and female who had the affected kids)
2. Second pedigree:
- Top left square (affected male):
aa
- Top right circle (unaffected female):
Aa
- Middle left square (unaffected male):
Aa
- Middle right circle (unaffected female):
Aa
- Bottom left square (affected male):
aa
- Bottom right circle (unaffected female):
AA or
Aa (but she has an affected son, so must be
Aa)
Number of children the original couple have:
2
Number of grandchildren:
3
Parent Tip: Review the logic above to help your child master the concept of human pedigree worksheets.
