Edited by mbhcsf at 18-1-2019 10:58 AM
cloning stem cells u pergi ke arah specific sangat
cloning therapeutic
but kalau human cloning etc
nilaian secular berdasarkan KEJAYAAN sahaja atau ayat ; tanpa kun faya kun' ( berani ye a manusia - wow - u reminded me of teh day of alastu -  - i wish hidayah untuk you ...) tak dapat mengatasi persoalan etika dan moral berkenaan cloning secara am ...
u pandai sebab u tahu bidang you - u go for stemcell
tapi clining per se in general
not therapeutic cloning yg produce stem cells - akan jadi isu moral dan ethics
What are the potential drawbacks of cloning animals?Reproductive cloning is a very inefficient technique and most cloned animal embryos cannot develop into healthy individuals. For instance, Dolly was the only clone to be born live out of a total of 277 cloned embryos. This very low efficiency, combined with safety concerns, presents a serious obstacle to the application of reproductive cloning. Researchers have observed some adverse health effects in sheep and other mammals that have been cloned. These include an increase in birth size and a variety of defects in vital organs, such as the liver, brain and heart. Other consequences include premature aging and problems with the immune system. Another potential problem centers on the relative age of the cloned cell's chromosomes. As cells go through their normal rounds of division, the tips of the chromosomes, called telomeres, shrink. Over time, the telomeres become so short that the cell can no longer divide and, consequently, the cell dies. This is part of the natural aging process that seems to happen in all cell types. As a consequence, clones created from a cell taken from an adult might have chromosomes that are already shorter than normal, which may condemn the clones' cells to a shorter life span. Indeed, Dolly, who was cloned from the cell of a 6-year-old sheep, had chromosomes that were shorter than those of other sheep her age. Dolly died when she was six years old, about half the average sheep's 12-year lifespan.
ini yg menyokong bu pada I - still under study ....depa pun kata dalam kajian..
scientific american kata okay - depa ni prpponets gang mana? ade pihak yg menyokong ade yg menentang basd on interest? https://www.scientificamerican.com/article/send-in-the-clones-cloned-mammals-are-just-as-healthy-as-their-natural-counterparts/ https://www.fda.gov/animalveterinary/safetyhealth/animalcloning/ucm055512.htm
Myth: When clones are born, they’re the same age as their donors, and don’t live long.Clones are born the same way as other newborn animals: as babies. No one really knows what causes aging in mammals, but most scientists think it has to do with a part of the chromosome called a telomere that functions as a kind of clock in the cell. Telomeres tend to be long at birth, and shorten as the animal ages. A study on Dolly (the famous sheep clone) showed that her telomeres were the shorter length of her (older) donor, even though Dolly was much younger. Studies of other clones have shown that telomeres in clones are shorter in some tissues in the body, and are age-appropriate in other tissues. Still other studies of clones show that telomeres are age-appropriate in all of the tissues. Despite the length of telomeres reported in different studies, most clones appear to be aging normally. In fact, the first cattle clones ever produced are alive, healthy, and are 10 years old as of January 2008.
studies still tak consistent
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Post time 18-1-2019 09:31 AM
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