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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Recessive and dominant genetics - Pitx1 case study

Hey, so in my readings on recessive and dominant genetics, I have come across a question that is pretty basic but still stumping me (maybe from burning my eyes with endless hours of reading) Question: How would a mouse embryo differ from the ...

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by scienceguy914
Mon Sep 08, 2014 1:44 am
Forum: Genetics
Topic: Recessive and dominant genetics - Pitx1 case study
Replies: 0
Views: 424

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: 1672

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: 1674

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: 910

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: 7
Views: 4375
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