Uniparental disomy (UPD) is the presence of
two chromosomes or genes from the same
parent. The diagram of a Southern blot shows
two different types of UPD in PWS: isodisomy
and heterodisomy. In isodisomy the two parental
alleles are identical (two maternal alleles 1
shown in the diagram). In heterodisomy the
two alleles are of the same parental origin, but
differ
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