These genes account for only about 3 per cent of our DNA.
These codons mark the end of the protein and stop the addition of amino acids to the end of the protein chain. Proteins form the structure of our bodies, as well playing an important role in the processes that keep us alive.
The DNA molecule is a double helix: Search Site only in current section. Search Site.
Chromosomes If you took the DNA from all the cells in your body and lined it up, end to end, it would form a strand 6000 million miles long but very, very thin! Related Stories. But your genes also mean that you probably look a bit like other members of your family.
Only one of your two copies needs to be defective for you to develop the disease. The simplest thing DNA can tell you is whether someone is male or female.
The codon wheel above can be used to translate DNA codons into amino acids. What is the 'Central Dogma'? The sex chromosomes determine whether you are a boy XY or a girl XX. The packaging of DNA into chromosomes Human beings have 23 pairs of chromosomes in every cell, which makes 46 chromosomes in total.
Skip to content. The cell reads the DNA code in groups of three bases. Around one in 25 of the UK population carry one faulty copy of the gene that causes the disease. You are here: The DNA code contains instructions needed to make the proteins and molecules essential for our growth, development and health.
It can carry information. The largest chromosome, chromosome 1, contains about 8000 genes. Human beings have 20,000 to 25,000 genes.
Genes are small sections of DNA within the genome that code for proteins. This work is licensed under a Creative Commons Licence. All known cellular life and some viruses contain DNA. The DNA double helix showing base pairs The sides are sugar and phosphate molecules.