So after each division, the telomeres get shorter and one of the things that may happen after a while is that pieces of the genes themselves get broken off the Chromosomes.
2
基因改造，就是借助某种特别的酶，删除选中基因片段。
Genetic modification can be used to cut out selected pieces of DNA (or genes) using special enzymes.
3
首先，一些多余的基因片段被永久性地写入细胞染色体组。
First, they permanently inserted the extra genes into the reprogrammed cell's genome.
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