Two biological parents who both have type AB blood can produce a biological child with typ… — Armed Services Vocational Aptitude Battery (ASVAB)

Two biological parents who both have type AB blood can produce a biological child with type O blood.

Cevap: Cevap

False

The statement is false because expressing type O blood requires the homozygous recessive genotype (

ii

). Parents with type AB blood have the genotype

I^A I^B

, which contains only the codominant

I^A

and

I^B

alleles. Because neither parent carries the recessive

i

allele, they cannot produce a child with type O blood.

Determine the genotypes of the parents from their blood phenotypes.

Both parents have the genotype

I^A I^B

The ABO blood group system exhibits codominance, meaning a person with type AB blood must have one

I^A

allele and one

I^B

allele.

Determine the possible allele combinations that the offspring can inherit.

The possible offspring genotypes are

I^A I^A

(type A),

I^A I^B

(type AB), and

I^B I^B

(type B).

Each parent can contribute either an

I^A

or an

I^B

allele during gamete formation.

Evaluate whether the genotype for type O blood can be produced.

A child cannot have type O blood.

Type O blood is homozygous recessive (

ii

), requiring an

i

allele from each parent, which neither type AB parent possesses.

Codominance and Multiple Allele Inheritance in ABO Blood Groups

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