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en.wikipedia.org/wiki/Allele

An allele is a variant form of a given gene. Sometimes, different alleles can result in different observable phenotypic traits, such as different pigmentation. A good example of this trait of color variation is the work Gregor Mendel did ... If the alleles are different, they and the organism are heterozygous with respect to that gene.

www.quia.com/jg/1708569list.html

allele, a different form of gene. dominant allele, an allele whose trait always shows up in the organism when the allele is present. recessive allele, an allele that ...

www.answers.com/Q/An_allele_whose_trait_always_shows_up_in_the_organism

An allele that is always phenotypically expressed whenever present in the genome is a dominant allele. However, if the gene is inhibited or switched off by act of ...

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Another word for heterozygous, one dominant and one recessive allele ... One whose trait always shows up in the organism when the allele is present, Dominant ...

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An allele whose trait always shows up in the organism when the allele is present.

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The offspring of many generations that have the same traits. ... An allele whose trait always shows up in the organisms when the allele is present. Dominant ...

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... a trait Alleles The different forms of a gene Dominant Allele An allele whose trait always shows up in the organism when the allele is present Recessive Allele  ...

sciencing.com/allele-gene-masks-recessive-allele-14042.html

Apr 25, 2017 ... The alleles that make up the genes of an organism, known ... and examined them for a specific set of characteristics, or traits, such as ... In these instances where a recessive gene is present in an organism but masked by a dominant ... a snapdragon plant has two red alleles, or RR, it will always be red, ...

www.bbc.co.uk/schools/gcsebitesize/science/21c/genes/genetic_diseasesrev1.shtml

A dominant allele always shows, even if the individual only has one copy of it. ... describes the genetic make-up of an organism (the combination of alleles).