knowledge -WSS

knowledge

author：comprehensive 2025-09-27 23:32:02 - browse：23472

Dolly sheep — Alex Hogan/STAT, Getty Images

Dolly, the first animal to be cloned from an adult of its species, was born 20 years ago today at the Roslin Institute in Scotland. When her creators announced what they had done, it triggered warnings of rich people cloning themselves for spare parts, of tyrants cloning soldiers for armies, of bereaved parents cloning their dead child to produce a replacement — and promises that the technique would bring medical breakthroughs. Which raises some questions:

Why are there no human clones?

Because of scientific, ethical, and commercial reasons.

The scientists who created Dolly — named after Dolly Parton, naturally — removed the DNA from a sheep ovum, fused the ovum with a mammary epithelial cell from an adult “donor” sheep, and transplanted the result, now carrying DNA only from the donor, into a surrogate ewe. But that technique, called somatic cell nuclear transfer (SCNT), turned out not to be so easy in other species.

Get unlimited access to award-winning journalism and exclusive events.

Subscribe Log In

Previous article： In Memoriam: Notable people who died in 2023
Next article： Abortion pill mifepristone to soon be dispensed at CVS, Walgreens

WSS

International team creates first chimeric human

Should insurance cover cosmetic surgery?

Obesity now affects over 1 billion people worldwide, study finds

J&J reports mixed data on next

Should insurance cover cosmetic surgery?

Change Healthcare cyberattack outage could last weeks

leisure time

knowledge

Why are there no human clones?

entertainment

Tori Bowie and the unacceptable rates of Black maternal death

Obesity now affects over 1 billion people worldwide, study finds

Biden outlines 'new path' to provide student loan relief after Supreme Court rejection

Why some fertility treatments produce more boy babies

Drug repurposing or repositioning? The language matters

New research sheds light on how often breast cancer is overdiagnosed

What does generative AI mean for health care? We asked experts

RaDonda Vaught to speak at CommonSpirit event on patient safety

Biden outlines 'new path' to provide student loan relief after Supreme Court rejection

Readout Newsletter: Ironwood, Pfizer, FogPharma updates

leisure time

AstraZeneca loses challenge to Medicare drug price negotiation

New research sheds light on how often breast cancer is overdiagnosed

The Bio Revolution is changing business and society

Beyond aggravation: Constipation is an American epidemic

FDA does about

Kristina Burow of ARCH Venture Partners shares her next big bets STAT

Wikipedia

focus

entertainment

hotspot