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Variation in a 250 base pair (bp) fragment of the mitochondrial cytochrome b (cyt b) has been used extensively for population studies in Atlantic cod Gadus morhua. To study the shape of the gene genealogy and the nature of the polymorphism, sequences of another region of the cyt b gene and the TP intergenic spacer were added, making a total of 566 bp from 74 cod from the Faroe Islands. A total of 44 segregating sites defined 41 haplotypes, many at frequencies greater than 5%. Haplotype diversity was 0.97 and nucleotide diversity 0.73% per base. A topology referred to as a constellation gene genealogy was observed with four major haplotypes at high frequencies, from each of which a number of rare variants were derived. A young relative age of the haplotypes was gauged from the structure of the genealogy. The variation was mostly at synonymous sites within the coding region and thus likely to be neutral or under weak purifying selection. By comparative analysis this also applies to the TP spacer. Applying the locus to study population variation in the Faroe Islands by AMOVA revealed that the overall areas and localities within areas accounted for none of the variation, and all the variation was due to differences among individuals.

Extent of mitochondrial DNA sequence variation in Atlantic cod from the Faroe Islands: a resolution of gene genealogy