The articles Haplotype and Haplogroup overlap thematically. Information that you are looking for here can therefore also be found in the other article.
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A haplotype (from the ancient Greek ἁπλούς haplús, German 'simple' and τύπος týpos, German 'likeness', 'pattern'), an abbreviation of 'haploid genotype', is a variant of a nucleotide sequence on one and the same chromosome in the genome of a living being. A particular haplotype can be individual-, population- or even species-specific.
As in the International HapMap Project, the alleles compared can be individual combinations of SNPs that can be used as genetic markers. If some of the individuals have the same haplotype due to common ancestry at a certain gene locus, they are combined into a haplogroup.
