When John Mendola's beloved pet dog was diagnosed with terminal cancer he decided to have her cloned. Mr Mendola is a retired New York police officer. Back in 2006 he was on duty at a station on Long Island when a small, scruffy stray dog was brought in.
Woolly mammoths roamed some of the coldest places on Earth before becoming extinct around 4,000 years ago, but a new bioscience company, has plans to bring them back.
Monkey embryos containing human cells have been made in a laboratory, a study has confirmed. The research, by a US-Chinese team, has sparked fresh debate into the ethics of such experiments.
Improved technologies for extracting genetic material from fossils may help us find out more about our ancient ancestors. Scientists in Israel have just developed a new technique to retrieve better quality, less contaminated DNA from very old remains, including human bones.
US researchers have found a way to dramatically increase the harvest of stem cells from adult tissue. It is a practical step forward in techniques to produce large numbers of stem cells without using embryos.
Scientists have re-constructed part of the genetic code that would have existed in a common ancestor of placental mammals, including humans. The creature, thought to be a nocturnal shrew-like animal, lived alongside dinosaurs about 75 million years ago.
Scientists drew their conclusions after interviewing identical twins about their experiences of sharing exactly the same genes with somebody else. The team said the twins believed their genes played a limited role in shaping their identity.
Meat and milk from cloned cattle and their offspring are safe to consume, independent scientists have said. The Advisory Committee on Novel Foods and Processes said it believed the food was unlikely to present any risk.
The creator of Dolly the sheep has been granted a licence to clone human embryos for medical research. Professor Ian Wilmut and Kings College London scientists will clone early stage embryos to study motor neurone disease (MND).
A US fertility specialist is planning to implant a cloned human embryo in a woman's womb but experts say it is "unethical and irresponsible". Doctor Panos Zavos is to hold a press conference in London on Saturday to announce the latest details of his cloning research.
Scientists have extracted and decoded the DNA of a cave bear that died 40,000 years ago. They plan to unravel the DNA of other extinct species, including our closest ancient relatives, the Neanderthals.
Scientists have pieced together part of the genetic recipe of the extinct woolly mammoth. The 5,000 DNA letters spell out a large chunk of the genetic code of its mitochondria, the structures in the cell that generate energy.
Genome editing, or genome engineering, or gene editing, is a type of genetic engineering in which DNA is inserted, deleted, modified or replaced in the genome of a living organism.
UK scientists have been given the go-ahead by the fertility regulator to genetically modify human embryos. It is the first time a country has considered the DNA-altering technique in embryos and approved it.