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The ever-increasing number of genome sequencing and resequencing projects isa central source of insights into the ecology and evolution of non-modelorganisms. An important aspect of genomics is the elucidation of sexdetermination systems and identifying genes on sex chromosomes. This not onlyhelps reveal mechanisms behind sex determination in the species under study,but their characteristics make sex chromosomes a unique tool for studying themechanisms and effects of recombination and genomic rearrangements and how theyaffect adaption and selection. Despite this, many sequencing projects omit suchinvestigations. Here, we apply a simple method using sequencing coveragestatistics to identify scaffolds belonging to the sex chromosomes of minkewhale, and show how the sex chromosome system can be determined using coveragestatistics alone. Using publicly available data, we identify the previouslyunknown sex of an Antarctic minke whale as female. We further investigatepublic sequence data from the different species and sub-species of minke whale,and classify genomic scaffolds from a published minke whale assembly as X or Ychromosomal sequences. Our findings are consistent with previous results thatidentified a handful of scaffolds as sex chromosomal, but we are able toidentify a much larger set of scaffolds, likely to represent close to thecomplete sex chromosomal sequences for the minke whale. Sequence coveragestatistics provides a readily available tool for investigating the sexdetermination system and locate genes on sex chromosomes. This analysis isstraightforward and can often be performed with existing resources.

Using sequencing coverage statistics to identify sex chromosomes in minke whales