DNA deoxyribonucleic acid?
Ok now what's the probability of two non related persones having the same dna I know its 1 in a littel over 7 billon but dose any one know the actual number. Its for a science project thank you and if u can't help any imput may yield some result
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Two non-related humans share almost like 99.9% similar DNA. They reason why is all human more or less share same characteristics (like they have exactly same respiratory, circulatory, nervous etc systems). The only difference you see (visually) is that 0.1% mostly in the form of SNPs (Single Nucleotide Polymorphism) which is on average, one base in 1000 bp (difference).
So, imagine 2 humans (non-related) both having 6 billion bp (2x23 chromosomes)
and the difference is about 1 in 1000 bp.
Then the total difference between them would be about 6 million bp.
No one has the same DNA. ever.