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Biology one
Genes the different characteristics an individual inherits, e.g. the colour of dogs' coats
Environment the conditions in which an individual develops, e.g. how much someone weighs.
Genes carry the information needed for an individual organism to develop. Different genes control
the development of different characteristics, e.g. eye colour. Genes in long strings these are called
chromosomes. These are located inside the nucleus of every cell in the organism. Chromosomes are
made of DNA molecules.…read more

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Structures found in the nucleus of most cells
They consist of deoxyribonucleic acid or DNA.
A section of DNA has a genetic code called a gene
The proteins can either be ­ structural proteins such as the ones found in muscles and hair or
enzymes, such as proteases and other digestive enzymes. Chromosomes normally come in pairs.
Both chromosomes in a pairs have the same sequence of genes, i.e. the same genes in the same
place. Different species have different numbers of pairs.…read more

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Cystic fibrosis
Cystic fibrosis (CF) is caused by a recessive allele. People with CF normally carry
abnormally thick and sticky mucus on their lungs and airways. As a result they are more
likely to get respiratory infections.
Genetic Tests
Genetic testing can determine whether a person is carrying the alleles that can cause a
genetic disorder. It can be done at any stage of a person's life. There are several types of
genetic tests, including testing for medical research.…read more

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