In cancer cells you notice that the chromosomes are not shortening,even after many cell divisions.A mutation in the expression of which gene might lead to this observation?

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Telomerase is responsible for maintaining the length of telomeres, which protect the ends of chromosomes during cell division. Cancer cells often have high levels of telomerase activity, which allows them to continue dividing without shortening their telomeres. A mutation in the expression of telomerase could lead to the observation that the chromosomes are not shortening.

In Cancer Cells You Notice That the Chromosomes Are Not