Difference between revisions of "Recessive Allele"
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: When a [[genotype]] includes one [[Dominant Allele|dominant allele]] and one [[Recessive Allele|recessive allele]] the physical appearance of the person will be based on the [[Dominant Allele|dominant allele]]. | : When a [[genotype]] includes one [[Dominant Allele|dominant allele]] and one [[Recessive Allele|recessive allele]] the physical appearance of the person will be based on the [[Dominant Allele|dominant allele]]. | ||
: When there are two copies of the [[Recessive Allele|recessive allele]] the physical appearance of the person will be based on the '''recessive allele'''. | : When there are two copies of the [[Recessive Allele|recessive allele]] the physical appearance of the person will be based on the '''recessive allele'''. | ||
| − | : In a [[Punnett Square]] or [[Genetic Cross Diagram]] | + | : In a [[Punnett Square]] or [[Genetic Cross Diagram]] [[Dominant Allele|dominant alleles]] are written with a capital letter while the [[Recessive Allele|recessive alleles]] are written with a lower case letter. |
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| + | ===References=== | ||
| + | ====AQA==== | ||
| + | |||
| + | :[https://www.amazon.co.uk/gp/product/1782946381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946381&linkCode=as2&tag=nrjc-21&linkId=5ec5fc3f6429e30c1d9ab9bca2bccf93 ''Recessive alleles, page 217, GCSE Combined Science Trilogy; Biology, CGP, AQA ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1782945954/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945954&linkCode=as2&tag=nrjc-21&linkId=100574c08fbbb64318256eb79ed61a76 ''Recessive alleles, page 265, GCSE Biology, CGP, AQA ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1471851362/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851362&linkCode=as2&tag=nrjc-21&linkId=7d78d70a2044ee9982dae010c94af92a ''Recessive alleles, pages 36, GCSE Combined Science Trilogy 2, Hodder, AQA ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Recessive alleles/phenotypes, pages 209-213, GCSE Biology; Third Edition, Oxford University Press, AQA ''] | ||
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| + | ====Edexcel==== | ||
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| + | :[https://www.amazon.co.uk/gp/product/1782948120/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948120&linkCode=as2&tag=nrjc-21&linkId=dedef775c6a43dbb0a609441525adac0 ''Recessive alleles, page 101, GCSE Biology, CGP, Edexcel ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1782945741/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945741&linkCode=as2&tag=nrjc-21&linkId=30da4f2178da182547b62a7329d13b57 ''Recessive alleles, page 28, GCSE Combined Science; The Revision Guide, CGP, Edexcel ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1782946748/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946748&linkCode=as2&tag=nrjc-21&linkId=a4f0348fc37d0ba1bb52d27f8679581f ''Recessive alleles, page 38, GCSE Biology; The Revision Guide, CGP, Edexcel ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1292120207/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120207&linkCode=as2&tag=nrjc-21&linkId=22455ff53961978667722edaa64c0be5 ''Recessive alleles, page 64, GCSE Biology, Pearson, Edexcel ''] | ||
| + | |||
| + | ====OCR==== | ||
| + | :[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Recessive alleles, page 51, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/0198359810/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359810&linkCode=as2&tag=nrjc-21&linkId=d768d99f1a06f7c12fab40e5aef85a55 ''Recessive alleles, pages 156-157, Gateway GCSE Biology, Oxford, OCR ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1782945660/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945660&linkCode=as2&tag=nrjc-21&linkId=83aa4500ad7759e7f401a1c5ba5df758 ''Recessive alleles, pages 70, 71, Gateway GCSE Biology; The Revision Guide, CGP, OCR ''] | ||
Latest revision as of 17:47, 18 December 2019
Contents
Key Stage 4
Meaning
A Recessive allele is an allele which can only be expressed in the phenotype when there are two copies of that allele.
About Dominant Alleles
- When a genotype includes one dominant allele and one recessive allele the physical appearance of the person will be based on the dominant allele.
- When there are two copies of the recessive allele the physical appearance of the person will be based on the recessive allele.
- In a Punnett Square or Genetic Cross Diagram dominant alleles are written with a capital letter while the recessive alleles are written with a lower case letter.
References
AQA
- Recessive alleles, page 217, GCSE Combined Science Trilogy; Biology, CGP, AQA
- Recessive alleles, page 265, GCSE Biology, CGP, AQA
- Recessive alleles, pages 36, GCSE Combined Science Trilogy 2, Hodder, AQA
- Recessive alleles/phenotypes, pages 209-213, GCSE Biology; Third Edition, Oxford University Press, AQA
Edexcel
- Recessive alleles, page 101, GCSE Biology, CGP, Edexcel
- Recessive alleles, page 28, GCSE Combined Science; The Revision Guide, CGP, Edexcel
- Recessive alleles, page 38, GCSE Biology; The Revision Guide, CGP, Edexcel
- Recessive alleles, page 64, GCSE Biology, Pearson, Edexcel