Do human cells contain only one copy of the genome?

Question

Does each cell contain only a single copy of its genome? Or are there ever 'extra' copies present. **Reason behind question**: *Wondering whether gene mutations could be corrected by referencing a 'backup copy'.. If such a thing exists..*

Answer 1

No, Human cells typically contain two copies of genome , not one. These two chromosomes are homologous chromosomes with one herited from each parent