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...ference in a single nucleotide. In this case we say that there are two ''[[allele]]s'' : C and T. Almost all common SNPs have only two alleles. ...tion, SNPs can be assigned a [[minor allele frequency]] — the lowest allele frequency at a [[locus (genetics)|locus]] that is observed in a particular

{{r|Allele}}

...of Independent Assortment]]. For genes on separate [[chromosome]]s each [[allele]] pair shows independent segregation. ...The ''A'' allele of the first gene can pair with either the ''B'' or ''b'' allele of the second gene). Consequently, in the F1 generation, four different ge

...'' concentrates and reinforces different versions of [[gene]]s, known as [[allele]]s, over time. The fixation of alleles leading to undesirable traits are th

{{r|Allele}}

...nd two new alleles became dominant, prn2 and prn3. Due to these shifts in allele frequencies, vaccines that were effective in earlier years are no longer ef

{{r|Allele}}

...tension allele, meaning it is homozygous (has two copies) of the recessive allele, e, the black pigment is blocked, and the horse is red. ...ver the body or preferentially concentrated in certain areas. The dominant allele, A, causes eumelanin (black pigment) to be restricted to the horse's points

....ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=DetailsSearch&Term=1559 2C19] [[allele]] and so may have drug interactions<ref>[http://www.medicalletter.org/restr ...promo=ONFLNS19 |issn=}}</ref> and patients with a loss of function CYP2C19 allele have higher rates of cardiac events.<ref name="pmid19106084">{{cite journal

...Stevens-Johnson syndrome]] (SJS) may occur in patients with [[HLA]]-B*1502 allele who take carbamazepine.<ref>Anonymous. [http://www.fda.gov/cder/genomics/ge

...% of patients may have a reduced-function allele with the reduced function allele being more common in asians and africans and less common in anglos and hisp Beside testing for the CYP2C19*2 [[allele]] may reduce the occurrence of patients with high on-treatment platelet rea

...ted to produce an F1 (first) generation with only yellow seeds because the allele for yellow seeds is dominant to that of green. A monohybrid cross compares

...e D2 receptors, which may be predisposed by genetic polymorphisms of the [[allele]], may cause [[neuroleptic malignant syndrome]].<ref name="pmid15094790">{{

....gov/sites/entrez/?db=gene&cmd=Retrieve&dopt=summary&list_uids=1565 2D6] [[allele]].

...led a pastoral lifestyle, probably due to selective pressure for the new [[allele]]s. ...lable or consumed or have not been consumed for several generations. The [[allele]] that expresses the lactose intolerance [[phenotype]] (as the decline in t

...of all German Shepherd Dog colored coat variations. When the recessive ‘e’ allele is inherited from each breeding pair parent, the e/e genotype offspring of ...paired with a white GSD always produces full colored puppies because the e allele is recessive.)

...tion into or out of a population may be responsible for a marked change in allele frequencies (the number of individual members carrying a particular variant ...d percent. In Europe, which has much lower levels of malaria, have either allele '''Fy^a''' or '''Fy^b'''. By measuring the frequencies

...oduce [[homozygote]]s in which the gene is only present as the disrupted [[allele]], and the effects of the non-expression of the gene may determined by comp

...ary processes acts. Without mutation, there are no new [[gene]]s, no new [[allele]]s and, eventually, no evolutionary change. ...[recombination]] event, in an organism that previously had two different [[allele]]s.