One of the few black rhinos still living in the wild experiences a new mutation in its brain cells. It is improbable that this mutation will spread to the entire population. So the statement is false.
A mutation in biology is an adjustment to the nucleic acid sequence of an organism's, virus's, or extrachromosomal DNA. DNA or RNA can be found in the viral genome. Errors in DNA replication, viral replication, mitosis, meiosis, or other types of DNA damage (such as pyrimidine dimers from exposure to ultraviolet radiation) can result in mutations. Damaged DNA may then undergo error-prone repair, particularly microhomology-mediated end joining, error during other types of repair, or result in a mutation during replication (translesion synthesis).
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