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

Blood typing cannot definitively prove parentage, it can only indicate a possibility.

Step-by-step explanation:

Prior to the development of DNA fingerprinting, blood type was used to determine possible parentage. However, blood typing could only show that someone might be a parent, but not definitively prove parentage. Therefore, none of the statements A, B, C, and D are true regarding parentage based on blood typing.

Answer 2

D.

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

Step-by-step 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.