The asterisk represents the origin of replication what enzyme binds here

Then enzymes  in repair synthesis and ligation put together the new synthesized stretches of DNA to make a continue of strand contains only DNA.  DNA ligase is a link the main enzyme for DNA replication; incitation of the covalent bonding of the 39 end of a new DNA fragment to the 59 end of a growing chain. 

this is a good question! i'll do some research and come back when i have the answer!

sex cells are usually half's then they find another half and make a fertilize egg