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Created page with "==Key Stage 4== ===Meaning=== A mutation is a change to the DNA in a cell which causes a new variant of a gene. ===About Mutations=== : M..."
==Key Stage 4==
===Meaning===
A [[mutation]] is a change to the [[DNA]] in a [[Cell (Biology)|cell]] which causes a new [[variant]] of a [[gene]].
===About Mutations===
: [[Mutation]]s occur randomly so they cannot be predicted.
: Most [[mutation]]s are errors which occur during [[DNA]] replication in [[Cell Division|cell division]]. However, some can occur due to [[DNA]] becoming damaged by [[Ionising Radiation|ionising radiation]].
: [[Mutation]]s affect [[Gene Expression|gene expression]]. Since [[gene]]s act as templates for building [[protein]], if a [[gene]] has been altered by [[mutation]] the [[protein]]s will also be changed.
: [[Mutation]]s lead to the [[protein]]s, [[Coding DNA|coded]] for by a [[gene]], to have a different shape and function. A [[mutation]] may cause the [[Active Site|active site]] of an [[enzyme]] to change, leading to a [[substrate]] no longer fitting in the [[Active Site|active site]] or, in rare cases, a different [[substrate]] fitting the [[Active Site|active site]].
===Meaning===
A [[mutation]] is a change to the [[DNA]] in a [[Cell (Biology)|cell]] which causes a new [[variant]] of a [[gene]].
===About Mutations===
: [[Mutation]]s occur randomly so they cannot be predicted.
: Most [[mutation]]s are errors which occur during [[DNA]] replication in [[Cell Division|cell division]]. However, some can occur due to [[DNA]] becoming damaged by [[Ionising Radiation|ionising radiation]].
: [[Mutation]]s affect [[Gene Expression|gene expression]]. Since [[gene]]s act as templates for building [[protein]], if a [[gene]] has been altered by [[mutation]] the [[protein]]s will also be changed.
: [[Mutation]]s lead to the [[protein]]s, [[Coding DNA|coded]] for by a [[gene]], to have a different shape and function. A [[mutation]] may cause the [[Active Site|active site]] of an [[enzyme]] to change, leading to a [[substrate]] no longer fitting in the [[Active Site|active site]] or, in rare cases, a different [[substrate]] fitting the [[Active Site|active site]].