Dominance hypothesis. The dominance hypothesis attributes the superiority of hybrids to the suppression of undesirable recessive alleles from one parent by dominant alleles from the other.
dominance
dominant character; one of a pair of alternative characters that is always expressed when its gene is present and that appears to exclude the other (recessive) character ...
Dominance and Crossing Over
Mendel's Law & Mendelian Genetics
Chromosomes X and Y and Sex Determination
Chromosome Mutations
Genetic Mutations
Mutation Frequency and Polyploidy
Theory of Natural Selection ...
dominance hierarchy A social structure among a group of animals in which one is dominant and the others have subordinate nonbreeding positions.
dominant Refers to an allele of a gene that is always expressed in heterozygotes.
dominance hierarchy
A linear "pecking order" of animals, where position dictates characteristic social behaviors.
dominant allele ...
Dominance: The property possessed by some alleles of determining the phenotype for any particular gene by masking the effects of the other allele (when heterozygous).
Codominance
The observation of a phenotype caused by independent expression of both alleles of a gene in a diploid.
codominance A type of inheritance in which heterozygotes fully express both alleles.
codon A sequence of three nucleotides in messenger RNA that codes for a single amino acid.
Codominance Situation in which two different alleles for a genetic trait are both expressed.
See also: autosomal dominant, recessive gene
Codon See: genetic code ...
Codominance and Multiple Alleles- Example: ABO blood group
Up to this point, we have discussed two possible alleles for any gene locus. For example, at the flower color locus, there is either the red or the white allele (A or a).
Apical Dominance
Growth of the shoot apex (terminal shoot) usually inhibits the development of the lateral buds on the stem beneath. This phenomenon is called apical dominance.
apical dominance. Growth of the bud at the apex of a stem or tuber while growth of all other buds on the stem or tuber is inhibited.
Dominance variance
Genetic variance at a single locus attributable to dominance of one allele over another.
Related Terms:
Genetic variance ...
dominance hierarchy. A social ranking, formed through agonistic behavior, in which individuals are associated with each other so that some have greater access to resources than do others.
Overdominance. Selection favoring heterozygotes
Oxygen dissociation curve. A curve showing the percent saturation of a blood pigment, such as hemoglobin, as a function of oxygen concentration of the fluid ...
apical dominance
The Biology Project Department of Biochemistry and Molecular Biophysics The University of Arizona Thursday, October 30, 1997
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Autosomal dominance is a pattern of inheritance characteristic of some genetic diseases. "Autosomal" means that the gene in question is located on one of the numbered, or non-sex, chromosomes.
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Definition of codominance :
The situation in which a heterozygote shows the phenotypic effects of both alleles fully & equally, (eg blood group antigens).
In genetics, dominance describes the effects of the different versions of a particular gene on the phenotype of an organism. Many animals and plants have two copies of each gene in their genome, one inherited from each...
Full article ...
Incomplete dominance. A condition where a heterozygous off- spring has a phenotype that is distinctly different from, and intermediate to, the parental phenotypes. See Heterozygote, Phenotype.
Genetics - Incomplete Dominance
So far, we have seen that a gene pair is made up of two genes inherited from the parents of a living thing. We have seen that a dominate gene will mask, or hide the traits of a recessive gene.
- Genes that interact but do not show dominance. They do not have individually recognizable phenotypic effects; rather, these genes have cumulative or additive effects.
Additive variance ...
A term coined by Galton for the tendency of the quantitative traits of offspring to be closer to the population mean than are their parents' traits. It arises from a combination of factors - dominance, gene interactions, ...
The advantage of this method is that it can prevent very fit individuals from gaining dominance early at the expense of less fit ones, which would reduce the population's genetic diversity and might hinder attempts to find an acceptable solution.
Evenness: The component of diversity accounting for the degree to which all species are equal in abundance, as opposed to strong dominance by one or a few species.
 See also: Organ, Plant, Character, Species, Trans
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