>> (As an aside, is there such a thing as half identical twins?) > > well, one can imagine a pair of siblings (incl. fraternal twins) who > happened to share exactly 50% of their dna. and if they were franternal > twins, they'd also share prenatal environment. but you'd have to do a > pretty serious amount of looking to see exactly what % of their genomes > were shared, and of course *which* genes would matter, too...
How about if the egg splits and is fertilized by two different sperm? Half-identical? Judy http://icehorses.net http://clickryder.com
