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GCSE RETAKE REVISION
science B1

Hayley Bull





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21st century science

Revision

Biology one














Variation

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…

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Chromosomes

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…

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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…

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