Dictionary » A » Allele

Allele

Definition

noun, plural: alleles

(genetics)

One member of a pair (or any of the series) of genes occupying a specific spot on a chromosome (called locus) that controls the same trait.


Supplement

For example, a pair of alleles controlling the same trait, i.e. eye color: one allele codes for blue eyes, another allele for brown eyes.

In humans, simple traits such as eye color may be caused by the interaction of only one pair of alleles. But for complex traits, such as height, they are usually caused by the interactions of series of alleles. Some alleles are dominant over other alleles, as in the case of heterozygous pairings (where paired alleles are different, in contrast to homozygous pairings where alleles are the same). In the above example, since the alleles code for different eye colors they are heterozygous.

Colloquially, the term gene is used when referring to an inherited trait that is usually accompanied by a phenotype as in ‘tall genes’ or ‘bad genes’ – but the more proper (scientific) term for this is allele.


Word origin: From German Allel, shortened from Allelomorph, from English allelomorph.
Related forms: allelic (adjective), biallelic (adjective), diallelic (adjective), monoallelic (adjective), allelism (noun), nonallelic (adjective).
Synonym: allelomorph.
See also: gene, trait, loci, DNA, chromosome.


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Isogamous organisms

... a type of organism in which the was no differentiation between the gametes, both are 100% identical (of course, there could be mutations, but no allele differentiation in matching-type regions, like the positive + and negative - mathing types in some algaes), and with a sexual reproduction. In ...

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by jaumzaum
Thu Oct 02, 2014 11:47 pm
 
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Topic: Isogamous organisms
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Views: 26

Re: Re:

Unless you're suggesting that some "races" have better genetics than others. Allele frequencies vary between poopulations. The question is not whether there's a difference (in genetic IQ predisposition), but how large that difference is. I think the adoption ...

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by wildfunguy
Wed Jul 30, 2014 8:50 pm
 
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Microevolution verus Macroevolution

Evolution is defined as variation in the frequencies of alleles, where an allele is a specific iteration of a given gene. Microevolution is defined as variations in the frequencies of alleles below species level, in a population of organisms. Macroevolution ...

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by hackenslash
Thu Mar 06, 2014 8:57 am
 
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Blood Genetics help please

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by girlslovebarbie
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Pedigree Analysis Question

... they will produce a child which is affected. How do I do so? 3) I am then asked to calculate the probability that either A or B have a recessive allele. 4) Finally, I need to find the probability that A&B will produce a child that has a recessive allele. Thanks very much! Any help is appreciated!

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by ApothemCyte
Sat Jan 18, 2014 8:44 pm
 
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