in order to get the SNPs of chromosome 1 ( homo sapiens,) I went to BioMart page on the site ensembl.org. I selected "Ensembl Variation 83"/"Homo Sapiens Short Variants(SNPs and indels excluding flanked variants)" as dataset and set the filter to chromosome 1. The data file I downloaded contains 1 488 472 records all with different rs numbers and different chromosome positions. As far as I know, that the chromosome 1 should have about 130K SNPs. So, my question is, did I do something wrong by obtaining the data? How should I reconcile this large discrepancy?
thanks in advance