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homozygote

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additive alleles

Overview page. Subjects: Psychology.

A pair of alleles combining to produce a heterozygote that is phenotypically the average of the two corresponding homozygotes.

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balanced polymorphism

Overview page. Subjects: Biological Sciences.

A genetic polymorphism that is stable and is maintained in a population by natural selection, because the heterozygotes for particular alleles have a higher adaptive value (i.e. fitness)...

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breeding true

Overview page. Subjects: Plant Sciences and Forestry.

Producing offspring whose phenotypes are identical to those of the parents. Homozygous individuals (see homozygote) necessarily breed true (unless mutations arise), whereas heterozygotes...

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cis-trans test

Overview page. Subjects: Biological Sciences.

A test used to determine whether two independent mutations, affecting the same phenotypic function, occur within the same cistron or on different cistrons. A pair of homologous chromosomes...

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coefficient of inbreeding

Overview page. Subjects: Plant Sciences and Forestry — Zoology and Animal Sciences.

The probability that two allelic genes forming a zygote are both descended from a gene found in an ancestor common to both parents. It is also used for the proportion of loci at which an...

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dimer

Overview page. Subjects: Biological Sciences.

A chemical entity consisting of an association of two monomeric subunits; e.g., the association of two polypeptide chains in a functional enzyme. If the two subunits are identical, they...

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fixation

Overview page. Subjects: Zoology and Animal Sciences.

1 The condition in which a gene occurs at 100% frequency in a population; i.e. there is no polymorphism, all members of a population being homozygous for a particular allele at...

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genetic polymorphism

Overview page. Subjects: Biological Sciences.

The regular and simultaneous existence in the same population of two or more discontinuous variants or genotypes, at a frequency existing in more than 1% of the population, that cannot ...

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heterosis

Overview page. Subjects: Biological Sciences.

The greater vigor in terms of growth, survival, and fertility of hybrids, usually from crosses between highly inbred lines. Heterosis is always associated with increased heterozygosity. See...

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heterozygote

Overview page. Subjects: Plant Sciences and Forestry.

Any cell or organism having two different genes (alleles) at one or more corresponding loci on homologous chromosomes. With respect to such loci a heterozygote will produce two different...

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