George Gutman (ggutman at MEDED.MED.UCI.EDU) wrote:
: "Siblings" refers to offspring of the *same* parents, not just
: genetically identical parents. The offspring of different mating pairs
: of inbred mice, for example, are not siblings, despite the fact that they
: are genetically identical to each other (as well as to their parents, and
: all other members of the same inbred strain). So the human offspring in
: question are certainly not "siblings".
Perhaps what is safest to say is that such offspring are not siblings
but are genetically _indistinguishable_ from sibs. This might be
a useful property in some contexts.
And BTW, all members of an inbred mouse strain are obviously not
genetically identical -- there is an obvious bimodal distribution
of genotypes :-)
Department of Molecular & Cellular Biology
Department of Genetics
robison at mito.harvard.edu