Which one of the following conditions represents autopolyploidy?
1
More than two sets of chromosomes, both of which are from the same parental species.
2
More than two sets of chromosomes, both of which are from the different parental species.
3
More than two sets of chromosomes only from a single parent.
4
Duplication of a chromosomal locus leading to spontaneous increase in the copy number of a gene.