Answer:
Because each DNA strand is made up of one "conserved" old piece of DNA and one new piece.
Step-by-step explanation:
during DNA replication once the two strands are unzipped on strand is older an theater strand is new
This process is said to be 'semiconservative' because one strand from each parent is conserved and remains intact after replication has taken place.
9.4m questions
12.2m answers