Q.4 Describe DNA Replication.
Answer:
Definition
It is a process in which one parental DNA is divided into two genetically identical daughter DNA molecules. DNA replication takes place before cell division. Purpose
It is done to make the copies of chromatids of chromosomes.
Unwinding of DNA strands
First step in DNA replication is unwinding of DNA: As a result, two strands are separated, much like two sides of zipper.
Template strands
Each strand of parental DNA acts as a template.
Complimentary strands
New strands are called as complimentary strands.
Base pairing
Nitrogenous bases of nucleotides in template strands make pair with nitrogenous bases of ‘ nucleotides in complimentary strands.
New (Daughter) DNA Double helix
One template and one complimentary strands together form a new DNA double helix, genetically identical to parents.