Single-Nucleotide Polymorphisms (SNPs): Difference between revisions

Single-Nucleotide Polymorphisms (SNPs) (view source)

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 . One copy of the major allele and one copy of the minor allele (heterozygous) <br> <br>
-When two people have at least once matching allele at a SNP, it is a half match, if both SNPs match it is a full match, and if neither SNP matches it is no match. Since there are only three possible combinations at each spot, most people will be either a full or half match at any one SNP by coincidence even though they are not related. In fact, somebody who is heterozygous will match everybody on earth at that spot. This is why it is important that hundreds or thousands of SNPs in a row match to be confident that a matching segment is truly identical by descent.
+When two people have at least once matching allele at a SNP, it is a half match, if both SNPs match it is a full match, and if neither SNP matches it is a non match. Since there are only three possible combinations at each spot, most people will be either a full or half match at any one SNP by coincidence even though they are not related. In fact, somebody who is heterozygous will match everybody on earth at that spot. This is why it is important that hundreds or thousands of SNPs in a row match to be confident that a matching segment is truly identical by descent.
 == Phasing ==