A mother of blood type A gives birth to a child with blood type O. Which of the following could...


A mother of blood type {eq}\rm A {/eq} gives birth to a child with blood type {eq}\rm O {/eq}. Which of the following could not be the blood type of the father?

Select one:

a. {eq}\rm A {/eq}.

b. Any type is a possible blood type of the father.

c. {eq}\rm AB {/eq}.

d. {eq}\rm B {/eq}.

e. {eq}\rm O {/eq}.

Blood Type:

Blood is one of the body fluids, and its function is to facilitate the transport of gases, nutrients, and wastes to their target cells. The erythrocytes present in the blood comprise some surface antigens, and depending on the type of antigen, the blood of individuals is classified into several different types.

Answer and Explanation: 1

The most well-known system of blood typing is the ABO system; in this system, the O-type of blood is recessive to both the other types (A and B). The expression of blood types A and B show codominance. This suggests that the presence of blood type O in the child is possible if the child inherits type O alleles from both parents.

The mother has blood type B, and in order for the child to have type O blood, the father can have any blood type except AB blood type.

The AB type of blood lacks alleles for blood type O and comprises alleles of type A and alleles of type B.

Therefore, the correct option is c.

Please note that:

  • Option a. is incorrect because blood type A can have a heterozygous genotype with an allele of blood type O.
  • Option b. is incorrect because the father can have any blood type, except for the AB type of blood.
  • Option d. is incorrect because the O type of blood allele can be present in type B blood.
  • Option e. is incorrect because blood type O will have a homozygous allele for this blood type.

Learn more about this topic:

Blood Types: ABO System, Red Blood Cell Antigens & Blood Groups


Chapter 13 / Lesson 5

Blood types are determined by antigens found in red blood cells. Learn about the blood types, red blood cell antigens, agglutination, the ABO system, the blood groups, and the definitions of universal donor and universal recipient blood types.

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