DNA does stay in urine as urine does contain DNA but in much lower concentrations that in the blood or saliva.
The DNA in urine is also highly fragmented and therefore degrades quickly so it is difficult to extract the DNA from urine to use for reliable DNA test results.
The DNA in urine comes from a variety of different sources which include the bladder or urethra cells and some DNA in urine comes from your bloodstream that crosses the kidney barrier and is called transrenal DNA.
DNA in urine can also be bacterial, mitochondrial and genomic.
Your DNA can also stay on a toothbrush for as long as 1 month.
DNA has been recovered from toothbrushes after 1 month.
DNA stays in teeth for as long as the person is alive.
However once a person dies or the teeth are removed from the body the DNA in the teeth tend to decline after to 2 years to 10 years.
At 77 F DNA can be isolated from the teeth after 19 years.
At 98 F DNA can be isolated from the teeth in as little as 6 months.
Teeth are also often used as the only source of DNA available for identifying human remains which are degraded or fragmented.
The composition of teeth and their location in the jawbone also protect the DNA which makes them a good source of DNA in many cases.
A person's DNA stays in you for up to an hour after kissing.
Male DNA can be detected in a woman's saliva for up to an hour after you kiss.
When two people kiss they exchange bacteria and mucus as well as some DNA which is your genetic doe.
No matter how fleeting the kissing encounter was the DNA will hang around and remain in the other persons mouth for up to 60 minutes which is an hour.
Although, the amount and detectability of the DNA decreases over time due to the natural cleansing process of saliva and swallowing.
Sperm DNA in the mouth though can remain in the mouth for up to 8 hours.
Human DNA is a molecule that contains the genetic information for an organism's development and function.
DNA is short for deoxyribonucleic acid and is made up of 2 strands which twist around each other to form a double helix.
Each strand has a backbone of alternating sugar and phosphate groups and each sugar also has a base that is attached to it.
The bases are called adenine (A), cytosine (C), guanine (G), and thymine (T).
The 2 strands are held together by chemical bonds between the bases with adenine pairing with the thymine and cytosine pairing with guanine.
The diploid human genome is composed of 46 DNA molecules of 24 distinct types.
And because human chromosomes exist in pairs that are almost identical, only 3 billion nucleotide pairs (the haploid genome) need to be sequenced to gain complete information concerning a representative human genome.