5.
a. Mother's genotype: ii
b. Father's genotype: IAIB
c. Baby's genotype: IBi or IBIB
d. Punnett square showing all possible genotypes for children produced by this couple:
| | IA | IB |
|-----|-----|-----|
| i | IAi | IBi |
e. Was the baby switched? No
6.
a. Mother's genotype: IAIA or IAi
b. Father's genotype: IBIB or IBi
c. Baby's genotype: IAIB
d. Punnett square that shows the baby's genotype as a possibility (example using IAi and IBi):
| | IA | i |
|-----|-----|-----|
| IB | IAIB| IBi |
| i | IAi | ii |
e. Was the baby switched? No
7.
The Postman could not be the father.
Punnett square (Mother IAi, Postman ii):
| | IA | i |
|-----|-----|-----|
| i | IAi | ii |
| i | IAi | ii |
Baby Type B (IBi or IBIB) is impossible.
8.
Pharmacist could not be the father.
Punnett square (Mother ii, Pharmacist ii):
| | i | i |
|-----|-----|-----|
| i | ii | ii |
| i | ii | ii |
Baby Type A (IAi) is impossible.
9.
Blood type data cannot prove who the father is because multiple men with compatible blood types can produce the same offspring blood type. It can only prove who the father is not, by eliminating men whose blood types make the baby’s blood type genetically impossible.
Parent Tip: Review the logic above to help your child master the concept of codominance worksheet blood types answers.
