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===About Variation===
: There is [[variation ]] between different species; different species look different from each other.: There is [[variation ]] within a species, creatures of the same species don't look exactly the same as each other.
: '''Variation''' is useful to help a species survive. If everyone was the same, what kills one person might kill everyone.
: '''Variation''' within a [[species]] can be [[Inheritance|inherited]] or caused by the environmental. Some people are born with 3 fingers (inherited variation) but others might lose fingers in an accident (environmental variation).
| style="height:20px; width:200px; text-align:center;" |One of these identical twins has decided to grow a mustache the other has decided to shave completely. This is '''environmental variation'''.
|}
==Key Stage 3==
===Meaning===
'''Variation''' is the differences between living creatures.
===About Variation===
: There is [[variation]] between different species; different species look different from each other.
: There is [[variation]] within a species, creatures of the same species don't look exactly the same as each other.
: Variation can be [[Continuous Variation|continuous]] or it can be [[Discontinuous Variation|discontinuous]].
===Continuous Variation===
: '''Continuous variation''' is '''variation''' where the differences change gradually across the [[species]].
Some examples of '''continuous variation''' are:
*Height
*Weight
*Nose Length
{| class="wikitable"
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|[[File:HeightBellCurve.png|center|400px]]
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| style="height:20px; width:400px; text-align:center;" |This [[graph]] shows how height varies across a [[population]] of [[human]]s.
|}
===Discontinuous Variation===
: '''Discontinuous variation''' is '''variation''' where the creatures fall into specific categories where they can only be one or the other, not half way in between.
Some examples of '''discontinuous variation''' are:
*Eye colour
*Number of legs
*Ability to roll the tongue
{| class="wikitable"
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|[[File:BarChartEyeColour.png|center|400px]]
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| style="height:20px; width:400px; text-align:center;" |This [[Bar Chart]] shows the number of people in a class with each eye colour. They cannot be half way between blue and brown, so eye colour is discontinuous.
|}
==Key Stage 4==
===Meaning===
'''Variation''' is the difference between [[organism]]s in an [[ecosystem]].
===About Variation===
: There is [[variation]] between different [[species]]; different [[species]] look different from each other.
: There is [[variation]] within a [[species]], [[organism]]s of the same [[species]] don't look exactly the same as each other.
: [[Variation]] can be [[Continuous Variation|continuous]] or it can be [[Discontinuous Variation|discontinuous]].
: [[Variation]] within a [[species]] is the result of both [[genetic]] and environmental factors.
: The greater the [[genetic]] [[variation]] within a [[species]] the more likely a [[species]] will survive changes in the environment. Individuals may die, but with enough [[variation]] some of them will be better [[Adaptation|adapted]] to the change in their environment.
===Genetic Variation===
: Most of the [[variation]] between different [[species]] can be accounted for by the [[DNA]] differences between those [[species]].
: The [[variation]] within a [[species]] is due to [[mutation]]s causing different [[phenotype]]s. These [[variation]]s caused by [[mutation|genetic mutations]] are the source of [[Evolution by Natural Selection|evolution]].
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10395 ''Variation, page 73, GCSE Combined Science; The Revision Guide, CGP, AQA '']
:[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Variation, page 95, GCSE Biology; The Revision Guide, CGP, 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 ''Variation, pages 199, 208-213, 218-234, 236-241, GCSE Biology; Third Edition, Oxford University Press, AQA '']
:[https://www.amazon.co.uk/gp/product/1471851338/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851338&linkCode=as2&tag=nrjc-21&linkId=425855d5890466e47189e1c21b67a1ea ''Variation, pages 23, 197, 198-200, GCSE Biology, Hodder, 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 ''Variation, pages 230, 231, 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 ''Variation, pages 255, 282, 283, GCSE Biology, CGP, AQA '']
:[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=27ad53b0283feeff7fc5ae04a9e205f586 ''Variation, pages 272-3, 277, GCSE Biology; Student Book, Collins, 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 ''Variation; Causes of, page 46, GCSE Combined Science Trilogy 2, Hodder, 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 ''Variation; Continuous and discontinuous, pages 47, GCSE Combined Science Trilogy 2, Hodder, AQA '']
:[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=27ad53b0283feeff7fc5ae04a9e205f587 ''Variation; continuous, page 272, GCSE Biology; Student Book, Collins, AQA '']
:[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=27ad53b0283feeff7fc5ae04a9e205f588 ''Variation; discontinuous, page 274, GCSE Biology; Student Book, Collins, AQA '']
:[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=27ad53b0283feeff7fc5ae04a9e205f589 ''Variation; environmental, page 274, GCSE Biology; Student Book, Collins, AQA '']
:[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=27ad53b0283feeff7fc5ae04a9e205f590 ''Variation; genetic, pages 274, 298, GCSE Biology; Student Book, Collins, AQA '']
====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 ''Variation, page 30, 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 ''Variation, page 42, GCSE Biology; The Revision Guide, CGP, Edexcel '']
:[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 ''Variation, pages 117-119, GCSE Biology, 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 ''Variation, pages 51, 60-61, 62, 70, 72-73, GCSE Biology, Pearson, Edexcel '']
====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 ''Variation, pages 66, 69, Gateway GCSE Biology; The Revision Guide, CGP, OCR '']