For blood type, blood type A and blood type B are dominant over blood type O. However, if a person with blood type A (AA) is crossed with a person with blood type B
(BB), their children's bood type would be AB. This is an example of

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.