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| style="height:20px; width:200px; text-align:center;" |A "widow's peak" is controlled by a particular [[gene]].
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==Key Stage 4==
===Meaning===
A [[gene]] is a small unit of [[DNA]] that provides instructions for a specific feature of an [[organism]].
===About Genes===
: There can be several [[allele]]s of the same [[gene]]. A [[human]] will inherit one [[allele]] of a [[gene]] from their mother and another [[allele]] of a [[gene]] from their father.