Science 7 - LAND and SEA BREEZE and its Characteristics
schemes for DNA replications
1. Schemes for DNA replication:
There are three possible schemes for DNA replication. These are:
1. Semiconservative replication
2. Conservative replication
3. Dispersive replication
2. Semiconservative replication:
■ The entire double helix does not remain intact when new DNA is being formed, instead
the two strands come apart. However, each strand is preserved intact.
■ Each daughter DNA molecule has an intact template strand and an intact newly
replicated strand.
3.
4. Conservative replication:
■ It is alternative method of replication.
■ In this type of replication the original double helix stay together and a new double
stranded molecule is built up next o them.
■ The original double helix acts as template for a new one, one daughter molecule would
consists of the original parent DNA and the other daughter would be totally new DNA.
5.
6. Dispersive replication:
■ In this type of replication the original strands break down and entirely new strands are
constructed from these and other precursors in the cell.
■ Some parts of original double helix are conserved and some parts are not.
■ Daughter molecules would consist of part template and part newly synthesized DNA.
