In medical genetics and blood transfusion compatibility, an individual with blood group AB… — JAMB UTME

In medical genetics and blood transfusion compatibility, an individual with blood group AB expresses both A and B antigens on their red blood cells. Which of the following best explains the genetic relationship between the $I^A$ and $I^B$ alleles?

The $I^A$ and $I^B$ alleles are codominant, allowing both antigens to be fully expressed.Cevap
B
The $I^A$ allele is completely dominant over the recessive $I^B$ allele.
C
The $I^A$ and $I^B$ alleles undergo incomplete dominance to produce a blended trait.
D
The trait is sex-linked and expressed only on the X chromosome.

Cevap

The

I^A

and

I^B

alleles display codominance, meaning both alleles are fully and independently expressed in individuals with blood group AB.

The correct option identifies codominance as the inheritance pattern where both

I^A

and

I^B

alleles are expressed equally and simultaneously in blood group AB individuals.

Adım Adım Çözüm

Identify the genotype associated with blood group AB.

An individual with blood group AB possesses the heterozygous genotype

I^A I^B

Each parent contributes one allele (

I^A

I^B

) to the offspring.

Analyze how the alleles manifest in the phenotype.

Both antigen A and antigen B are present on the membrane of red blood cells.

When two different alleles are both expressed in a heterozygous organism, the genetic phenomenon is called codominance.

Anahtar Kavram

Codominance in ABO Blood Groups

Tahmini Süre:45s

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