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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Need some help in this bio question

... related to Mendel and the Gene. Here are the questions: 1) Given that The leaf shape gene of a plant has two alleles: A and a. A is completely dominant to a, and results in oval, rather than round leaves. Given the following cross, what is the F1 generation? Cross: Aa x aa a) 1AA: 2Aa: 1aa ...

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by bradnoell
Thu Feb 05, 2015 2:33 am
Forum: Genetics
Topic: Need some help in this bio question
Replies: 0
Views: 323

Allelic exclusion

Why do B cells undergo allelic exclusion at all...why they dont show normal dominant-recessive pattern

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by jannat
Thu Jan 22, 2015 4:19 am
Forum: Genetics
Topic: Allelic exclusion
Replies: 0
Views: 317

need help with some home work

... depending on the alleles which have been expressed-the person can turn out to be tall if he has-Tt(heterozygous) or TT(homozygous).-Here T is the dominant trait over t. whereas the person will become dwarf only if both the alleles for the gene is tt. (I hope this explanation of mine made some ...

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by Athira
Fri Jan 16, 2015 7:33 am
Forum: Genetics
Topic: need help with some home work
Replies: 2
Views: 909

need help with some home work

... are both homozygous for a recessive allele produce a heterozygote baby? I said yes here 2.Can A man and a woman that are both homozygous for a dominant allele produce a heterozygote baby? I said yes here 3. Can A dominant homozygous man and a heterozygous woman produce a recessive baby? I said ...

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by scoe
Thu Jan 15, 2015 6:55 pm
Forum: Genetics
Topic: need help with some home work
Replies: 2
Views: 909

I have got some BIG issues! forgive the long post

... on the chromosome 9 (Bernstein’s theory). The blood groups A and B are further subdivided into subgroups, with A being in a form A1 or A2 (A1 is dominant to A2) and B in many forms of seemingly no clinical importance. The ABH antigens are not primary gene products but instead the enzymatic reaction ...

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by saddy51
Sun Jan 04, 2015 10:39 am
Forum: Genetics
Topic: I have got some BIG issues! forgive the long post
Replies: 1
Views: 1749
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