Chromosomes are tightly packaged bundles of DNA, the chemical that encodes genetic information.
Most of the cells in a human body have a set of 46 chromosomes in their nucleus, while egg and sperm cells have only 23.
Separately, each of the mitochondria in each cell of a human body contain their own DNA, in the form of (multiple copies of) a circular chromosome.
Fertility doctors are claiming that a new method of treating women over the age of 37 could give them a much improved chance of having healthy children through in vitro fertilisation. The success rate of IVF drops in women as they reach their mid-30s - as the quality of their...
The US Department of Energy's Joint Genome Institute in California has tripled its capacity to sequence the human genome by leasing 24 MegaBACE DNA sequencers. The Joint Genome Institute, which is targeting human chromosomes 5,16 and 19, now has the capacity to sequence 14 million raw bases each day. Federal...
Dolly the cloned sheep could be genetically older than her years, according to follow-up research carried out by the Roslin Institute and its commercial arm PPL Therapeutics, where Dolly-style cloning was developed. Dolly may look like a three year old ewe, but the tips of her chromosomes - called telomeres - show...
A study investigating the genetic basis of homosexuality has failed to support research published six years ago suggesting the existence of a 'gay gene'. A team of scientists led by Dean Hamer, an American Aids researcher, caused controversy in 1993 when it published results of a study claiming to have...
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