A karyotype is an image of an individuals diploid set of chromosomes. A karyotype has 22 pairs of chromosomes.
enzymes break the hydrogen bonds that hold the double helix together. Then the two DNA strands unwind and separate. After they separate another enzyme makes primers, short, single strands of nucleotides. The primers serve as a place for DNA polymerase, which is the enzyme that assembles new strands of DNA.