Cloning: Science, Ethics & Belief

Overview

Why definitions matter

“Cloning” is often used as if it described a single technology. In biology and public debate, however, it can refer to several procedures with different purposes and outcomes. Confusing them can obscure the scientific facts and the ethical issues at stake.

Popular fiction has also shaped public expectations. Real laboratory techniques do not produce a fully formed duplicate person, nor would shared DNA create identical memories, character or life experience. Genes are only one influence on development.

Reading this archive

The linked pages preserve historical discussion, legislation and reporting. Older pages should be read as records of their period rather than as current medical guidance. Scientific terminology has changed, and some early expectations about clinical applications remain unproven.

Essential distinctions

Three uses of the word

The procedures share some vocabulary, but their immediate goals differ substantially.

01

Embryo splitting

An early embryo is divided so that more than one embryo with substantially the same nuclear DNA may develop. It is sometimes called artificial twinning because it resembles the process that produces identical twins.

History and ethical discussion

02

Reproductive cloning

Somatic-cell nuclear transfer places genetic material from a body cell into an egg cell whose nucleus has been removed. The aim would be gestation and birth. Animal research has shown serious safety concerns, and proposed human use has faced broad ethical and legal opposition.

Continue the introduction

03

Research cloning

Often historically called therapeutic cloning, this begins with nuclear transfer but does not aim at birth. Researchers seek stem cells for studying disease or potentially developing compatible tissue. The creation and use of an embryo is central to the ethical dispute.

Procedure and proposed benefits

Ethical context

Why sincere conclusions differ

Views often turn on moral status, consent, safety, disability ethics, family relationships and the acceptable boundaries of biomedical research.

Concerns raised by critics

Some religious and ethical traditions hold that an embryo has full or substantial moral status from fertilization. From that perspective, creating an embryo for research and then ending its development is impermissible.

Critics also question the procurement of egg cells, possible exploitation, commercial pressure, equitable access and the prospect that research techniques could be redirected toward attempted human reproduction.

Arguments offered by supporters

Supporters have emphasized the possibility of studying inherited disease, developing patient-matched cell lines and reducing immune rejection. They may assign a different moral status to an early laboratory embryo than to a born person.

Support is often conditional on independent oversight, voluntary consent, firm limits on reproductive use and evidence that the research cannot be achieved through less ethically contested methods.

Collection guide

Topics in the cloning archive

These links retain the archive’s original page structure while presenting the material in clearer groups.

Embryo & reproductive cloning

Research or therapeutic cloning

Historical news by year

Responses & policy

Reader guide

Frequently asked questions

Would a clone be the same person as the DNA donor?

No. Similar nuclear DNA would not create identical memories, personality, relationships or experience. Even naturally occurring identical twins are distinct people.

Is embryo splitting the same as nuclear transfer?

No. Embryo splitting divides an early embryo. Nuclear transfer moves the nucleus of a body cell into an egg cell whose own nucleus has been removed.

Does research cloning produce a transplanted organ?

Not by itself. The procedure has chiefly been discussed as a possible way to derive stem-cell lines for research and tissue development. Claims that it would readily supply whole organs were speculative.

Why is reproductive cloning considered unsafe?

Animal experiments have involved low success rates and significant developmental problems. Those concerns make attempted human reproductive cloning ethically unacceptable to many scientific and medical bodies.

Why do religious views differ?

Traditions and individuals differ over when personhood or full moral status begins, how potential medical benefit should be weighed, and whether creating embryos for research is permissible.

Are the linked news pages current?

No. They are dated archive materials. Readers should verify present law, medical consensus and scientific capability through current authoritative sources.

How can I report an error?

Use the contact page or email info@religioustolerance.en-html.org with the page title and correction.