Cell differentiation in developing embryos occurs due to which of the following? A. the genes that are active

B. the genes that are present

C. the number of copies of each gene present

D. the types of proteins produced by each gene

D The types of proteins produced by each gene

Explanation:

This is a late answer so im guessing its D because proteins have many jobs in regulating function and genes dont change the way a cell functions.

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."