Whole genome sequencing is ostensibly the method of determining the entire DNA sequence of an organism's genome at one time. This entails sequencing all of an organism's chromosomal DNA also as DNA contained within the mitochondria and, for plants, within the chloroplast. In practice, genome sequences that are nearly complete also are called whole genome sequences. Whole genome sequencing shouldn't be confused with DNA profiling, which only determines the likelihood that genetic material came from a specific individual or group, and doesn't contain additional information on genetic relationships, origin or susceptibility to specific diseases. additionally , whole genome sequencing shouldn't be confused with methods that sequence specific subsets of the genome - such methods include whole exome sequencing (1-2% of the genome) or SNP genotyping .