During prophase, dna condenses into x-shaped structures called what

Chromosomes

Explanation:

During interphase, the DNA is relatively "loose". However, during prophase, the DNA (in the DNA-protein complex called chromatin) becomes condensed. These condensed structures are called chromosomes, and are visible under a microscope. This is how the DNA is properly organised prior to cell division

a time line cause it goes from 685 to 978

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."