The phrase "a normal copy" is correct and usable in written English.
It can be used when referring to a standard or typical version of a document or item, often in contrast to a special or altered version.
Example: "Please send me a normal copy of the report so I can review the standard data before making any changes."
Alternatives: "a standard copy" or "a regular copy."
"But it was striking to see, with a normal copy edit, how totally different it was.
After several centuries of inbreeding, few Dalmatian have a normal copy of the gene.
In this way, doctors can excise a defective or mutated gene and replace it with a normal copy.
In most of these, simply adding a normal copy of the gene will not help; instead, the mutated gene must be inactivated.
While gene therapy entails adding a normal copy of the gene to compensate for the gene mutation, genome editing involves making changes to existing genes.
A faulty gene can then be repaired using the CRISPR-Cas 9 technology by providing a normal copy of the gene that the cell can use to repair.
Although two SMA patients had a single normal copy of SMN2, they also had a hybrid SMN gene.
Starting in 1983, Pereira-Smith and Smith published a series of studies establishing that senescence is a dominant genetic trait involving several as-yet-unknown genes (or groups of genes): In the simplest scenario, a cell enters cellular limbo only if it carries at least a single normal copy of each of the genes.
This revealed a single normal copy of chromosome 8 with the probes hybridized in the expected orientation and distance apart, and two derivative 8 chromosomes with the three probes closely juxtaposed.
There was a small deletion between 12.6 Mb and 13.9 Mb, including all of candidate cancer gene DLC1, on an otherwise normal copy of chromosome 8, and a much larger interstitial deletion between 14.2 Mb and 31.5 Mb on a del(8)(8p12-22).
For some graphic purposes, segmentation files were normalized by log2 median centering each sample separately resulting in an estimated normal copy number at zero, with positive values indicating an increase in copy number and negative numbers indicating a decrease in copy number.
