Difference between revisions of "Gene"
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*[[Coding DNA]] - [[Gene]]s which are '[[Gene Expression|expressed]]' which means used as the templates for [[Protein Synthesis|protein synthesis]]. | *[[Coding DNA]] - [[Gene]]s which are '[[Gene Expression|expressed]]' which means used as the templates for [[Protein Synthesis|protein synthesis]]. | ||
*[[Non-coding DNA]] - [[Gene]]s which affect whether other [[gene]]s will be [[Gene Expression|expressed]]. These [[gene]]s are said to 'turn off' parts of the [[DNA]] and can respond to environmental changes. | *[[Non-coding DNA]] - [[Gene]]s which affect whether other [[gene]]s will be [[Gene Expression|expressed]]. These [[gene]]s are said to 'turn off' parts of the [[DNA]] and can respond to environmental changes. | ||
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| + | ===References=== | ||
| + | ====AQA==== | ||
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| + | :[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f320 ''Gene, pages 24-2, 32, 236-9, 300-1, 304-5, 308-9, GCSE Biology; Student Book, Collins, AQA ''] | ||
Revision as of 11:13, 5 November 2019
Contents
Key Stage 3
Meaning
A gene is a small unit of DNA that provides instructions for a specific feature of an organism.
About Genes
- There is a gene that controls eye colour with a different version of the gene for each colour.
- There is a gene that controls whether a person has a widow's peak or not.
- There are a number of genes that control the colour of a person's skin or the shape of their nose.
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| An eye colour gene controls the colour of a person's eyes. | There are several genes that determine the number of spots on a dalmatian. | The shape of bird's beak is caused by a number of genes working together. | A "widow's peak" is controlled by a particular gene. |
Key Stage 4
Meaning
A gene is a small unit of DNA that provides instructions for a specific feature of an organism.
About Genes
- There can be several alleles of the same gene. A human will inherit one allele of a gene from their mother and another allele of a gene from their father.
- Only some characteristics are coded for by one gene. Most characteristics are controlled by a large number of genes in the genome.
Genes can be divided into two categories:
- Coding DNA - Genes which are 'expressed' which means used as the templates for protein synthesis.
- Non-coding DNA - Genes which affect whether other genes will be expressed. These genes are said to 'turn off' parts of the DNA and can respond to environmental changes.