Difference between revisions of "Recessive Allele"
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: 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]] [[Dominant Allele|dominant alleles]] are written with a capital letter while the [[Recessive Allele|recessive alleles]] are written with a lower case letter. | : 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==== | ||
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| + | :[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 ''] | ||
Revision as of 23:53, 10 November 2019
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