Dictionary » D » Dominant




(1) (Of, or pertaining to) An allele or a gene that is expressed in an organism’s phenotype, masking the effect of the recessive allele or gene when present.

(2) (Of, or pertaining to) An organism that expresses the dominant gene (or allele).

(ecology) (Of, or pertaining to) An organism or group of organisms having the most considerable influence or control in its ecological community among other organism.

(neurology) Of, or pertaining to the normal tendency for one side of the body or of one of a pair of organs to dominate or be used in consistent persistence than the other.


In genetics, the dominant is the one that determines the phenotype of an organism. Its effects are readily recognized than the effects of the recessive. Usually, a dominant allele is symbolized with a capital letter and the recessive allele a small letter, for example: Hh (where H refers to the dominant allele while h to the recessive allele).

In ecology, a dominant refers to an organism, such as an animal, dominating a social hierarchy and usually is the top predator with the greatest access to food resources, territory and mate.

In neurology, a person may be left-brained or right brained depending on which side of his brain is dominant or frequently used.

Word origin: Latin, dominant- (s. of domināns, prp. of dominārī, to dominate), equiv. to domin(us), master + -ant.

Related forms: dominantly (adverb).
Related terms: autosomal dominant, co-dominant alleles, dominant gene, dominant inheritance, dominant lethal trait, dominant trait, permanent dominant idea.

Compare: recessive.
See also: dominance.

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Genetics Pedigree Help Required

Based on the information in the pedigree of Family B, is inheritance of this hearing loss trait consistent with an autosomal dominant or autosomal recessive pattern? (Tip: assume autosomal dominant and assign genotypes of affected and unaffected individuals, then assume autosomal recessive ...

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by TheBell
Fri Mar 21, 2014 8:49 pm
Forum: Genetics
Topic: Genetics Pedigree Help Required
Replies: 0
Views: 1378

what is a dominant trait and the recessive trait?

How do you tell what is the dominant trait and the recessive trait in plants?

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by natureandbiology
Wed Mar 12, 2014 5:34 pm
Forum: Botany Discussion
Topic: what is a dominant trait and the recessive trait?
Replies: 2
Views: 1349

Rabbit colors

A hint: Black rabbit is double dominant brown (BB). White rabbit is double recessive brown (bb).

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by kau
Tue Mar 11, 2014 9:16 am
Forum: Genetics
Topic: Rabbit colors
Replies: 1
Views: 721

What makes dominant allele dominant?

... that more than one is recessive to all the others - what would happen if two different recessive genes are inherited? The same is true for dominant alleles. Therefore there has to be a mixture of co-dominant, incomplete dominant, recessive and dominant relationships between the alleles. ...

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by Tricho
Sun Mar 09, 2014 7:19 pm
Forum: Genetics
Topic: What makes dominant allele dominant?
Replies: 5
Views: 3682

What makes dominant allele dominant?

Can a gene have e.g. three alleles for three different colors. Which is (are) dominant? Must there be a dominant one? Can all be recessive?

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by kau
Sun Mar 09, 2014 3:47 pm
Forum: Genetics
Topic: What makes dominant allele dominant?
Replies: 5
Views: 3682
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