A<unk>  (or<unk>  is a change in an organism's genome that is acquired during its lifespan, instead of being inherited from its parent(s) through fusion of two haploid gametes.<unk> s that occur after the zygote has formed can be caused by a variety of sources that fall under two classes: spontaneous<unk> s and induced<unk> s. How detrimental a<unk>  is to an organism is dependent on what the<unk>  is, where it occurred in the genome and when it occurred.
Postzygotic mutation
Robertsonian translocation
Uniparental disomy
Germline mosaicism
Caudal duplication
Genomic imprinting
Sex-chromosome dosage compensation
Isodisomy