Question

Prior to the development of DNA fingerprinting, blood type could be used to determine possible parentage. Although it might prove someone was not a parent, it could not show if someone was positively the parent, only that he or she might be a parent. Which of the following is a true statement that can be made about parentage based on blood typing?
A. a parent with o blood type could never have a child with A blood type

b. a parent with type O blood could never have a child with type B blood

C. a parent with type A B blood never have a child with type B blood

D. a parent with type A B blood can ever have a child child with type O blood.​

Answer 1

D.

A parent with type A B blood can ever have a child child with type O blood.​

Explanation:

An offspring gets an allele for blood type from every parent. Therefore unless both parents have blood type O the offspring cannot have blood type O.

A person with blood group O means they do not blood group antigen on their red blood cells. They cannot pass the antigens to their offspring. A person with AB means they have both antigens for A & B blood groups and can pass either to any of the offspring they have.

The passing down of the blood group alleles follow the Mendelian principles of independent assortment.