Typically, the repair of DSB in living cells takes less than 24 h and, in many cases, excess DNA damage in higher eukaryotes, including insects, triggers necrotic or apoptotic processes [54], [55], [56].
Interestingly, in many cases using DNA sequence and protein sequence for the same gene resulted in different supported trees.
In many cases, junk DNA contains transposons that cause mutations and genes whose function is unknown possible relics from previous evolutionary steps.
In practice, genes are clustered; even more puzzling, in many cases both DNA strands of a protein coding gene are transcribed.
Indeed, in many cases, contaminating DNA may be both degraded (such as in skin fragments in dust particles) and deaminated (for example, when it has been deposited in or on a fossil or in chemical reagents for a long time).
In addition to the coding-gene transfers that benefitted the host, there were probably many cases of DNA sequence insertion that could not be expressed (if the insertion was to chromosomal sites lacking the correct regulation signals for the host transcription machinery).
In many cases wild type DNA sequences are required.
A significant number of Americans question both the system's over-all fairness and, given the many cases in which DNA evidence has proved that the wrong person was convicted of a crime, its ability to distinguish the innocent from the guilty.
Finally, an accurate history can aid in interpreting findings from genetic testing, since in many cases testing identifies DNA variations that may or may not be truly related to disease risk, but might be better understood in the context of the family's past medical experiences.
Interestingly, in many cases the transferred DNA contains clusters of genes known as pathogenicity islands that enable the recipient strain to adapt to the host environment [ 6– 11].
