Intensive stud 3 A week after wilmut's announcement, scientists in Oregon disclosed that they had used a different technique to clone monkeys, close cousins of humans. Faster than you can say Frankenstein, these accomplishments triggered a worldwide debate: Should scientists be allowed to clone animals? Will humans be next? Is cloning unethical and dangerous--or is it a valuable research tool?
Intensive Study 3 A week after Wilmut’s announcement, scientists in Oregon disclosed that they had used a different technique to clone monkeys, close cousins of humans. Faster than you can say “Frankenstein,” these accomplishments triggered a worldwide debate: Should scientists be allowed to clone animals? Will humans be next? Is cloning unethical and dangerous--or is it a valuable research tool?
Intensive stud 4 All attempts at cloning were largely unsuccessful until 1984. Thats when a scientist in Denmark separated cells from a sheeps embryo. An embryo is an early stage of development in which cells are busy dividing and "transforming" inte specialized cells like skin, eyes, or muscle cells 5 Unlike a skin cell, an embryo is on its way to becoming a complete living thing. The Danish scientist combined an embryo cell with an egg cell from another sheep. He implanted the fused cell -- then a newly growing embryo - into a grown female sheep. To much surprise, the embryo grew into a baby lamb. Since then, other scientists have used embryos to clone cattle, pigs, goats, rabbits-- and, now, even monkeys
Intensive Study 4 All attempts at cloning were largely unsuccessful until 1984. That’s when a scientist in Denmark separated cells from a sheep’s embryo. An embryo is an early stage of development in which cells are busy dividing and “transforming” into specialized cells like skin, eyes, or muscle cells. 5 Unlike a skin cell, an embryo is on its way to becoming a complete living thing. The Danish scientist combined an embryo cell with an egg cell from another sheep. He implanted the fused cell -- then a newly growing embryo -- into a grown female sheep. To much surprise, the embryo grew into a baby lamb. Since then, other scientists have used embryos to clone cattle, pigs, goats, rabbits-- and, now, even monkeys
Intensive stud 6 So what makes Wilmut's sheep unique? Instead of using early-stage embryo cells, wilmut used cells from the udder of an adult sheep. In theory, thats like using one of your skin cells to clone a new you 7 Wilmut knew that each cell of the body contains a full set of genetic instructions - a blueprint to grow a complete individual. (The only exceptions are egg and sperm cells, each of which contains half the genes to grow a new individual Once cells have specialized, on their way to becoming skin or eye or udder cells, most of the genetic instructions to make a full being are turned off. Until now, scientists believed that specialized cells could not be used to form a complete organism
Intensive Study 6 So what makes Wilmut’s sheep unique? Instead of using early-stage embryo cells, Wilmut used cells from the udder of an adult sheep. In theory, that’s like using one of your skin cells to clone a new you! 7 Wilmut knew that each cell of the body contains a full set of genetic instructions — a blueprint to grow a complete individual. (The only exceptions are egg and sperm cells, each of which contains half the genes to grow a new individual.) Once cells have specialized, on their way to becoming skin or eye or udder cells, most of the genetic instructions to make a full being are turned off. Until now, scientists believed that specialized cells could not be used to form a complete organism