Paper 1 doubts as biology November 2019

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A mutation occurs in a gene which prevents the production of telomerase.
What is the effect of this mutation if it occurs in bone marrow stem cells?

A a rapid increase in the production of lymphocytes
B a tumor grows in the bone marrow
C bone marrow stem cells eventually no longer divide
D the total blood cell count will be unchanged

Why the answer is C?
 
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