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Multiple Choice
Which of the following statements best explains how two parents with type A and type B blood can have a child with type AB blood?
A
The child inherits two A alleles, one from each parent, which combine to form AB blood.
B
The child inherits an O allele from one parent and an AB allele from the other parent.
C
The child inherits two B alleles, one from each parent, which combine to form AB blood.
D
The child inherits an A allele from one parent and a B allele from the other parent.
Verified step by step guidance
1
Understand the basics of blood type inheritance: Human blood types are determined by the ABO blood group system, which involves three alleles: A, B, and O. Each person inherits two alleles, one from each parent.
Recognize the genotype possibilities for type A and type B blood: A person with type A blood can have the genotype AA or AO, while a person with type B blood can have the genotype BB or BO.
Consider the combination of alleles: For a child to have type AB blood, they must inherit one A allele and one B allele. This means one parent must contribute an A allele and the other parent a B allele.
Evaluate the parental genotypes: If one parent has type A blood (genotype AA or AO) and the other has type B blood (genotype BB or BO), the child can inherit an A allele from the type A parent and a B allele from the type B parent.
Conclude the inheritance pattern: The child inherits an A allele from one parent and a B allele from the other parent, resulting in the AB blood type.