Dictionary » D » Dominant

Dominant

Definition

(genetics)

(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.


Supplement

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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Results from our forum


mutation-selection balance

... Hardy-Weinberg equation. Here are two relevant excerpts from my textbook, Medical Gentics by Jorde, Carey and Bamshad: Consider, for example, a dominant disease that results in death before the person can reproduce. This is termed a genetic lethal mutation because, even though the individual ...

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by Monco
Mon Mar 04, 2013 10:41 pm
 
Forum: Genetics
Topic: mutation-selection balance
Replies: 0
Views: 59

Human Pathology 'Multiple-Choice Questions'

... phase b. The midcycle surge of LH c. Fertilization d. The progesterone surge during the luteal phase 9. Granulosa cells are aspirated from a dominant follicle of a 25 year-old XX subject on day 11 of the menstrual cycle. Granulosa cells are then cultured in vitro, in the presence of LH and ...

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by ScrimmSphere
Mon Feb 04, 2013 11:03 am
 
Forum: Human Biology
Topic: Human Pathology 'Multiple-Choice Questions'
Replies: 0
Views: 284

Re: I really need help with the Punnett square & genotypic

if there are 25% be Red, 50% Pink and 25% White, it means the red is incomplete dominant. when heterozygous, it wont be appeared as dominant phenotype, it will appear as pink colour. In ur question, [(heterozygous) for red flower] this mean it is not incomplete ...

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by mavis
Mon Feb 04, 2013 5:52 am
 
Forum: Genetics
Topic: I really need help with the Punnett square & genotypic
Replies: 4
Views: 869

I really need help with the Punnett square & genotypic

they say dominant, but not whether it's completely dominant, hm :roll: I'd try 75% red and 25% white

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by JackBean
Fri Jan 25, 2013 9:47 am
 
Forum: Genetics
Topic: I really need help with the Punnett square & genotypic
Replies: 4
Views: 869

I really need help with the Punnett square & genotypic

... you JackBean, for taking your time and trying to help me. Would 25% be Red, 50% Pink and 25% White?? Or would it be 3/4 Red because red is the dominant and 1/4 White? Sorry im just trying to understand this. Im still not sure what to do for the F1 F2 generations.

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by Paigebentley
Fri Jan 25, 2013 7:22 am
 
Forum: Genetics
Topic: I really need help with the Punnett square & genotypic
Replies: 4
Views: 869
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