When traits are COMBINED together and each are expressed.

This is called CODOMINANCE

Explanation:

Codominance is an inheritance pattern that does not conform to Mendel's principle of inheritance i.e. non-mendelian inheritance. Codominance is the process whereby two alleles of a gene are both dominant for their respective traits and hence are simultaneously expressed when in a combined or heterozygous state.

An example is the ABO blood group system in humans. Alleles for A and B are codominant, meaning that, the two traits will be expressed when the two alleles are combined to form AB. Hence, according to this question, when traits are COMBINED together and each are expressed, it is called CODOMINANCE.

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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."