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111

clone

OLogy Series
biology
card
111

clone

OLogy Series
biology

Clones are plants and animals that have more than just their looks in common; they also have the exact same DNA sequence. Identical twins are natural clones. They look alike because they have the same genes and identical DNA. Today, scientists can even create clones from the cells of an adult animal. These clones are genetically the same as the adult -- only much younger.

Should Humans Be Cloned?
When Dolly the sheep became the first clone to be created from an adult mammal cell, people wondered if someday humans might be cloned. Even if this were possible, there are many questions. Is it right to clone humans? Should there be laws against it? Some people say that it's unnatural to create an exact copy of another person. On the other hand, cloning is an important technique that can be used in medicine. Even if humans were cloned, the clone would grow up to be a very different person because it would have different life experiences.

Armadillos give birth to babies that are clones of:

each other

their parents

their fathers

Are you right?

Correct!

Armadillo babies are clones of each other. Once a year, the armadillo produces a single egg. After it's fertilized, it divides in four and grows into identical quadruplets.

Clones are identical in every single way.

Fact
or
Fiction
?

Fiction

Clones may have exactly the same DNA, but it takes more than just genes to determine who a person is. Where you live, the people you know, and luck make us unique in many ways.

By using ancient DNA, scientists can create clones of extinct animals such as dinosaurs and woolly mammoths.

Fact
or
Fiction
?

Fiction

Extinct animals can be cloned only in fantasy movies. With current technology, ancient DNA is too damaged and incomplete to be cloned.

Clone
How: In humans, identical twins form when a fertilized egg splits in the womb at a very early stage. These twins are natural clones.
Animals that have been cloned: sheep, gaur
(an endangered cow), dairy cows, mice
News: In 1996, scientists cloned a baby sheep from the DNA of an adult sheep (Dolly).
Significance: could help to increase production
of livestock and improve medical research

Image credits: Kelvin Chan.