So this diagram basically summarizes the net result of DNA replication. So let's suppose we begin with the following double helix. Now if the upper strand of DNA runs from the three to the five direction, then the bottom strand runs from the five to three direction because these two strands are known to be antiparallel, they run parallel bond in opposite directions and these two individual single strands are held together by hydrogen bonds between the bases. Now following DNA replication we basically form two identical copies as shown. Now notice that these black single strands of DNA are the original strands of DNA and they are commonly known as parent strands or template strands while the blue ones are the newly synthesized strands and they are known as the door strand. So the process of DNA replication is semiconservative because each one of these copies contains one of the single strands that came from the original double stranded DNA and the other one shown in blue is the newly synthesized strand.