Information on all observed whole-chromosome gains. Each row is one gain. Columns:
donor: sperm donor
cell: cell barcode
chr: chromosome that is gained
ncopiesOfGainedChr: total number of this chromosome present in cell (2 is a gain of 1)
divisionOfOrigin: where nondisjunction that created this gain occurred (based on presence of 2 haplotypes at centromere - MI - or presence of only 1 haplotype - MII