Each person normally has one pair of sex chromosomes in each cell. Females have two X chromosomes, while males have one X and one Y chromosome. Early in embryonic development in females, one of the two X chromosomes is randomly and permanently inactivated in cells other than egg cells.
Lesson Summary. You should now understand that DNA helicase has a very important job to do. It is responsible for opening up our DNA to allow for replication as well as transcription of our DNA. A DNA helicase is an enzyme that functions by melting the hydrogen bonds that hold the DNA into the double helix structure.hat is, until they meet DNA helicase. In order for DNA polymerase (in replication) or RNA polymerase (in transcription) to see the nucleotide bases that are to be used as a template, these hydrogen bonds must be broken to expose the much-needed the nucleotide bases.
Confidence votes 21.0K. Ligase here means the reconnection or more specifically the re-splicing together of Dna 'fragments'. Dna ligase's role in Dna replication is to reconnect the Okazaki fragments that are created by the pattern of replication that takes place upon the COMPLEMENTARY 5'-3' strand of DNA.This happens because DNA polymerases can only read the DNA template from the 5' to the 3' end and add free nucleotides in this direction.NA ligase is responsible for joining together fragments of DNA. In DNA replication, after the primers are replaced by DNA Polymerase I, DNA ligase assists in the formation ph â¦ osphodiester bonds between the fragments. This is essential for creating one continuous strand.