Which step happens first in dna replication?

The initial start in DNA replication is the unwinding of the pair DNA strands that make up the helix that is to be replicated. DNA Helicase untwists the helix at positions called replication origins. The replication origin produces a Y pattern and is named as a replication fork.

videntify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.