In humans, there are four blood types: A, B, AB and O. Each parent can give their offspring one of three blood type alleles, IA (coding for phenotype A), IB (coding for phenotype B), or neither, which is expressed as i (coding for phenotype O). This trait displays codominance.

Tina has type O blood and her sister Rosa has type AB blood. What are the blood genotypes their parents must have?

Select the blood genotype for Parent One.

IAIA

ii

IBIB

IBi

IAi

IAIB

Select the blood genotype for Parent Two.

IBIB

ii

IBi

IAIB

IAIA

IAi

Tina has type O, which means she is ii and her sister is AB, so her genotype is IAIB. Now, to have a child with a recessive trait both parents has to carry at least one allele for the recessive, i. Rosa is type AB which means she had to have inherited one allele IA from one of her parents and the other IB from the other parent. Thus, one parent is IAi and the other is IBi.

Histrionicus Histrionicus · Answer 2 · 2021-11-26T12:09:14+01:00

The blood genotypes their parents in this given case, must have -

parent 1 - IAi
parent 2 - IBi

ABO blood group system is a classification system of the human blood group that is based on the presence or absence of A and B antigens on the surface of red blood cells (RBCs).

if the blood group is O, which is a recessive trait so both parents must have this type of blood group or at least one of them to have offspring with this blood group
Individuals with both antigens AB on RBC surface have blood group AB if both IA and IB both allele present and show codominance.
Individuals with antigen B on RBC surface have blood group B which means either one both alleles are IB or one allele is IB and the other is i
Individuals with antigen A on RBC surface have blood group A which means either one both alleles are IA or one allele is IA and the other is i

Thus, The blood genotypes their parents in this given case, must have -

parent 1 - IAi
parent 2 - IBi

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