Difference between revisions of "Dominant gene"

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{{merge|Dominant allele}}
 
{{merge|Dominant allele}}
  
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A '''Dominant gene''' is a gene that more often results in a specific [[physical]] characteristic, for example, a hereditary [[disease]], even though the patient's [[genome]] possesses only one copy. If one partner has a dominant gene, the chance of passing on the gene to children is 50-50 in each pregnancy, if both partners possess it, the chance increases to 75%, as a recessive gene will only show if paired with a recessive gene.
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A '''Dominant gene''' is an allele of an gene that gets expressed over a different allele when the organism has two different copies of a gene (and is therefore heterozygous). Black hair is dominant over blond hair in humans since when individual contains one copy of the gene for black hair and one for blond hair (therefore having a black and blond genotype), the black haired gene gets expressed and gives the individual a black-haired phenotype. However, this is a simplification of a complex process and many genes are not truly dominant.
  
 
[[Category:Genetics]]
 
[[Category:Genetics]]

Latest revision as of 02:04, October 26, 2008

It has been suggested that this article or section be merged with [[::Dominant allele|Dominant allele]]. (Discuss)

A Dominant gene is an allele of an gene that gets expressed over a different allele when the organism has two different copies of a gene (and is therefore heterozygous). Black hair is dominant over blond hair in humans since when individual contains one copy of the gene for black hair and one for blond hair (therefore having a black and blond genotype), the black haired gene gets expressed and gives the individual a black-haired phenotype. However, this is a simplification of a complex process and many genes are not truly dominant.

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