Many biologists assume that eukaryotic genomes are transmitted stably between generations with only minor variations. Yet, this presumed constancy is at odds with data indicating that eukaryotic genomes are dynamic, varying extensively in content among many different lineages. Thus, rather than being constant, genomes vary considerably within individuals during their lifetimes.
Parfrey, Laura Wegener and Katz, Laura A., "Dynamic Genomes of Eukaryotes and the Maintenance of Genomic Integrity" (2010). Biological Sciences: Faculty Publications, Smith College, Northampton, MA.