1. Given the following genotypes, describe the phenotypes (normal or albino)
AA → Normal
Aa → Normal
aa → Albino
Fill out the blanks on the pedigree →
[Top left: AA or Aa] [Top right: aa]
[Left circle: Aa] [Right circle: Aa]
[Bottom left square: aa] [Bottom right circle: AA or Aa]
a) How many children does the couple have? → 2
b) What is the sex of the oldest child? → Male
c) How many grandchildren does the couple have? → 3
2. Fill out the blanks of the pedigree (AA, Aa, or aa).
[Top left: Aa] [Top right: Aa]
[Left circle: aa] [Right circle: AA or Aa]
[Bottom left square: aa] [Bottom middle circle: Aa] [Bottom right circle: aa]
a) How many children did the original couple have? → 2
b) How many grandchildren? → 3
c) How many of their grandchildren are albino? → 2
d) Create an extension to the pedigree to show the other grandchild after marrying and having a son who is NOT albino.
[Add a male square connected to the middle bottom circle (Aa), labeled AA or Aa]
Parent Tip: Review the logic above to help your child master the concept of pedigree practice problems worksheet.
