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===About Variation===
: Not all 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 which is called '''variation'''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).
===Examplesof Inherited Variation==={| class="wikitable"|-|[[File:EyeColour.png|center|200px]]|[[File:VariationFrogs.png|center|200px]]|[[File:VariationSnails.png|center|200px]]|-| style="height:20px; width:200px; text-align:center;" |Eye colour '''varies''' from person to person.| style="height:20px; width:200px; text-align:center;" |The pattern on the backs of frogs shows '''variation'''.| style="height:20px; width:200px; text-align:center;" |'''Variation''' in patterns on snail shells means some are better camouflaged than others.|} ===Examples of Environmental Variation==={| class="wikitable"|-|[[File:VariationMice.png|center|200px]]|[[File:VariationTwins.png|center|200px]]|-| style="height:20px; width:200px; text-align:center;" |These mice are identical twins, but one has damaged its tail. The difference is an example of '''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:*HeightSkin *Weight*Nose Length{| class="wikitable"|-|[[File:HeightBellCurve.png|center|400px]]|-| 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 colourDogs*Number of legs*Ability to roll the tongue{| class="wikitable"|-|[[File:BarChartEyeColour.png|center|400px]]|-| 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 '']