How they do it...
IVF -PGD
Sperm that have been filtered by our standard sperm preparation process are allowed to fertilize the eggs obtained from the female "in vitro" (in our highly specialized fertility laboratory). The embryos resulting from this specialized fertilization process are then screened by our genetics team to determine both their gender and that selected chromosome pairs have resulted in an expected normal genetic pairing outcome (this process is called "aneuploidy" screening). This gender determination process at the very early development level as made famous by our Center, has resulted in the ability to provide sex selection results for the chosen gender far in excess of 99.9%. The aneuploidy (abnormal chromosome count) screening process also employed at the time of PGD gender determination also allows for the detection of limited genetic count abnormalities as a routine or for the optional screening of the embryos for a wide variety of additional genetic abnormalitites. Upon request, we can screen for genetic abnormalities such as Down's syndrome (one "extra" chromosome 21), Turner's syndrome (the absence of one of the two "X" chromosomes normally found in a female), and Kleinfelter's syndrome (a male with one "Y" chromosome and 2 "X" chromosomes instead of the normally found single "X" chromosome). New DNA microarray technology also provides us the option of screening embryos for a full (46 chromosome) genetic count.
Just A Few Celebrity Fraternal Twins
Rebecca Romijn (G/G)
Jennifer Lopez (B/G)
Angelina Jolie (B/G)
Holly Hunter (B/B)
Marcia Cross (G/G)
P Diddy G/G)
Melissa Etheridge (B/G)
Diana Krall (B/B)
Julie Roberts (B/G)
Angela Basset (B/G)
Nick Valensi (B/G)
Nancy Grace (B/G)
Norah O'Donnell (B/G)
Joan Lunden 2 sets both (B/G)
Gurindha Chadha (Director) (B/G)
Patrick Dempsey (B/B)
Manfred Mann (B/G)
Garcelle Beauvais-Nilon (B/B)
Mia Hamm (G/G)
Dennis Quaid (B/G)
Martie Maguire (G/G)
There are more, these were the most famous twins - and there will be more, it's pretty much a fad now, like Botox and saying you don't have a staff of 25 Nannies (or Baby Nurses), Body Guards and Assistants and you're "doing it all yourself" and "are a working Mom or Dad just like everyone else".
Like I said, it will be triples and quads next .... wonder how much People will pay for THOSE photos?
My Opinion