Blood Type Inheritance - Boston University
Blood Type Inheritance
Blood type genetically determined according to the following rules:
|Genotype (allele combination) |Phenotype (blood type) |
|AO or AA |Type A |
|BO or BB |Type B |
|AB |Type AB |
|OO |Type O |
A child’s genotype is a combination of the genotypes of his or her parents. Each parent contributes an allele to the genotype, as evident in these examples:
|Parents genotype |Child genotype |
|AO and AA |AA or AO |
|AA and BB |AB |
|AO and BB |AB, BO |
|AO and BO |AB, AO, BO, OO |
In the following problems, determine the probability of an offspring’s genotype using a punnett square.
| | |
| | |
1) Mother’s genotype – OO; Father’s genotype – BO. What is the probability that the child will have
a. Type O blood __________
b. Type B blood __________
c. Type AB blood _________
| | |
| | |
2) Mother’s genotype – AB ; Father’s genotype – AA. What is the probability that the child will have
a. Type AB blood _______
b. Type B blood ________
c. Type A blood ________
3) Mother’s blood type – A; Father’s blood type O. What are the possible genotypes that the mother and father could have?
a. Mother ___________________
b. Father ____________________
Is it possible for the child to have Type O blood? _______________ What would be the genotype of the child in that case? ____________
Is it possible for the child to have Type A blood? ________________ What would be the genotype of the child in that case? ____________
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