Have you ever thought that your neighbor owned a 24-meter long brontosaur for a pet dog, taught him tricks, then rolls over their house ? Everybody's dying to see an authentic live dinosaur. Remember Jurassic Park ? They took a dinosaur DNA sample from the gut of an amber-sealed Jurassic mosquito, filled in the gaps in the dinosaur DNA with frog DNA, and placed it in a viable host egg, then they've got big lizards for their tourist attraction. The procedures done in the film is almost the actual thing done in cloning life forms. However, back in reality, there are missing parts which are vital for dinosaur cloning and makes it questionable or impossible to do such. Here are some of the things that makes mass-production of dinosaurs a big question mark.

AMBER ENCRUSTED MOSQUITO - amber, a hard yellowish-brown fossilized tree resin, is a good preservative medium. There are lots of amber-sealed insects retrieved and scientists had already drawn DNA from these insects, but only insect DNA, not the DNA of it's last victim. The fossils were so tiny, and so as the information gathered. Even if the stone-age mosquito did have a big bite on a dinosaur, the dinosaur DNA would be easily damaged by the process of digestion. Lastly, the fossilized insects are no more than 40 million years old, 20 million years after the disappearance of dinosaurs, and 95 million years after the end of the Jurassic period.

DNA or Deoxyribonucleic Acid - the very precious, but fragile cellular substance that is responsible for hereditary instructions and input in every complex organism. Dinosaur DNA will not be clear and intact for the 65 million years that have passed since the dinosaur has gone to extinction. This is because of the fact that while humans and animals are alive, the DNA gets damaged 10 times every second. However, this is not much of a problem since there are special biological processes that repair damaged DNA. When life ceases, the reparation processes stop, and the DNA breaks down. If a mosquito feasted on a dinosaur and immediately gets trapped in tree resin and is preserved, the deterioration will slow down, but it will not stop. After 65 million years, the dinosaur DNA will be messed up and would be very difficult to decode.

DINOSAUR BLUEPRINTS - All DNA structures, be it human or animal or dinosaur, is made up of the same components, but they differ in sequencing. To find a piece of bird DNA, you would have to compare the sequences to an authentic bird DNA. In relation to the dinosaurs, there are no more existing dinosaurs, so whose DNA can be used for the identification of dinosaur DNA? The identification of dinosaur DNA would be quite an impossible task.

CLONING MEDIUM - there are no eggs fit for raising a dinosaur clone. A dinosaur egg is needed, of the same species and DNA to enable the clone to develop, but we don't have such.

The cloning of dinosaurs is within the point of possibilities and impossibilities. Yes, we have the technology of cloning animals, which was recently concluded by Dolly the Sheep, the first successful animal clone, but what we don't have are the biological raw materials that will take us to the rebirth of dinosaurs. As of now, the scene of having a brontosaur as a pet is still beyond the mist.

References:

University of California San Francisco
"Is Jurassic Park Possible ?"
http://www.ucsf.edu/research/science_made/jurassic.html

The Museum of Paleontology of The University of California at Berkeley
and the Regents of University of California
"Current Questions about Movie Dinosaurs"
http://www.ucmp.berkeley.edu/diaspids/popular.htm

DINOSAUR PICTURE - Velociraptor
http://www.msstate.edu/Movies/Pictures/Jurassic.jpg