Amistake by cellular machinery, or damage from an environmental agent such as radiation may produce a(n) which is a permanently altered segment of dna.

Mutated gene

A mistake by cellular machinery, or damage from an environmental agent such as radiation may produce a mutated gene which is a permanently altered segment of dna.  

A gene mutation is a perpetual change in the DNA sequence that forms a gene which makes the sequence different from what is present in most people. Gene mutations can be classified into; hereditary mutation (changes inherited from parents) and somatic mutation (changes caused by environmental factors such as ultraviolet radiation from the sun).

as in mitosis, dna replication occurs during interphase.   in meiosis, it occurs specifically in s phase of interphase 1.

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?