21. Larger plasmids tend to have lower copy numbers . 22. In this technique, two genomes are compared for their differences in copy number on a microarray. 23. A study was conducted on ancestral diet and the evolution of the human amylase gene copy number . 24. Due to the copy number variation chromosomes of different sizes can be combined in a new cell. 25. The " Msp " I representation is a control for copy number changes and PCR amplification difficulties. 26. Copy number variations can be generally categorized into two main groups : short repeats and long repeats.27. These differences are called copy number variants. 28. The result of this spontaneous change in the structure of DNA is a so-called copy number variation. 29. TRAM ( genetic ) says that it stands for Turnover, copy number and funtional Redundancy And Modulatory. 30. Deletions and duplications of greater than 1, 000 nucleotides are called copy number variants ( CNVs ).