Achromosomal mutation where a segment breaks off, flips, and then reattaches itself is called a(n): reciprocal translocation. translocation. inversion. duplication. deletion.

Inversion

Explanation:

This type of mutation is not as lethal on addition of deletion mutations. This is because it does not cause a frame-shift mutation.  Inversion only reverses the order of nucleotides in a section of a DNA strand and the genes in this regions may produce defective proteins.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.