Nov 28, 2010

The cloned animals that caused controversy

Dolly the sheep

The arrival of Dolly signalled a landmark in genetic technology, demonstrating that scientists could reverse cellular time by converting an adult sheep's cell into an embryo, which was then grown into a new sheep.

Her birth prompted a raging debate about the ethics and ramifications of cloning, with one writer claiming that Dolly "looks at you with those intense red eyes – eyes full of hate".

The ethical arguments against animal cloning were strengthened when she was put down in 2003 after contracting lung disease. She had been plagued by health problems and was also suffering from premature arthritis.

Cumulina the mouse
 
Cumulina was the first of more than 50 identical mice, spanning three generations, which were created at the University of Hawaii in 1998.

She was named Cumulina because she was created from the DNA of cumulus cells, which surround developing eggs in female mice's ovaries.

Cumulina was the first animal cloned from adult cells that survived to adulthood, and produced two healthy litters.

Noah the gaur
 
Noah the gaur – a southeast Asian species of wild cattle similar to bison – represented the first attempt by scientists to clone an endangered animal.

Scientists in America hoped to take a huge step in the fight to protect endangered species by having a cloned gaur born to an ordinary cow on a farm in Iowa.

However, Noah died soon after he was born in 2001.

CC the cat
 
CC, or Carbon Copy, was born in 2001, making her the first domestic pet to be cloned.

Scientists hoped that creating a carbon copy of the cat could offer millions of pet owners the chance to resurrect beloved family pets.

However, while Rainbow – the original cat – was a heavily built white cat with brown, tan and gold spots, CC was slender with a white coat and stripes of grey. in addition, the cats had wildly differing personalities – while Rainbow was reserved, CC was playful.

Read more at The Telegraph

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