Ever since we were kinds we all came to know about the first successful cloned animal was a sheep named ‘Dolly’. Poolgab brings to you some important facts and trivia about Dolly- the cloned sheep.
#1- NAMED AFTER
The sheep, made from breast cells, was famously named after Dolly Parton, the American singer known for her large chest as well as her voice.
#2- NOT THE FIRST CLONE
Several clones were produced in labs before Dolly the sheep including mice, sheep and cows. But all of them were cloned from the DNA from embryos. Frog being the first
#3- FIRST MAMMAL TO BE CLONED
Dolly the sheep was the first mammal to be cloned, not from a cell taken from embryos, but from an adult cell. This was highly significant because it showed that DNA from an adult cell, which has been programmed to express only a distinct subset of its genes, can be used to develop an entirely new organism.
The cell used as the donor for the cloning of Dolly was taken from the mammary gland of a 6 years old Finn-Dorset ewe. The unfertilized egg was taken from a Scottish Blackface ewe. From 277 fertilized eggs, 29 early embryos developed. They were planted into 13 surrogate mothers. Only one pregnancy went full term resulting in the birth of Dolly on 5 July 1996.
#4- MOST FAMOUS SHEEP
There was a special report on Dolly in the TIME and Science featured her as the breakthrough of the year. Since then Dolly has been widely called as “the world’s most famous sheep”.
#5- DIAGNOSED AT AGE OF 6
Dolly was euthanized on 14 February 2003 as she had developed a form of lung cancer called Jaagsiekte and severe arthritis.
#6- PREMATURE DEATH
A Finn Dorset has a life expectancy of around 11 to 12 years but Dolly lived for only 6.5 years. This led to scientists claiming that Dolly aged early as she was raised from a nucleus of a six year old sheep.
#7- FUTURE OF CLONING
In 2009, the cloning of Pyrenean ibex was announced. It is a form of mountain goat that was declared extinct in 2009. Although the clone died shortly after birth, it was the first time an extinct species was cloned.