nbme19/Block 1/Question#35

5 yo boy, right eye pain 1 week

Retinal cells

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submitted by mtthwgyd,

This is what is known as a somatic mutation: a mutation that occurs in non-germline cells and, therefore, only effects daughter cells derived from the parent cell with the mutation. So, a mutation occurred in a differentiated parent cell that gave rise to a set of daughter cells (which, in this case, were destined to become retinal tissue).