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hybrid

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area-effect speciation

Overview page. Subjects: Ecology and Conservation.

Speciation that is associated with an increased differentiation of two subspecies that have incompatible gene complexes, so that hybrids are strongly selected against.

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backcross

Overview page. Subjects: Biological Sciences.

In genetics, a cross between a hybrid (1) of the first generation and one of its parents, or the offspring resulting from such a mating.

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biological species concept

Overview page. Subjects: Zoology and Animal Sciences.

The view that the species comprises populations (or groups of populations) that are reproductively isolated from each other, i.e. that species should always be biospecies. This has been...

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blending inheritance

Overview page. Subjects: Biological Sciences.

The early theory that assumed that hereditary substances from parents merge together in their offspring. Mendel showed that this does not occur (see Mendel's laws). In breeding experiments...

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cattalo

Overview page. Subjects: Zoology and Animal Sciences.

A fertile hybrid between a domestic bull (Bos taurus) and an American bison cow (Bison bison).

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chromosome substitution

Overview page. Subjects: Plant Sciences and Forestry — Genetics and Genomics.

The replacement of one or more chromosomes by others (totally or partially homologous) from another source (either a different strain of the same species or a related species that will...

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complementation test

Overview page. Subjects: Plant Sciences and Forestry.

(cistrans test)

A test to determine whether two mutant sites of a gene are on the same cistron. It is performed by introducing two mutant chromosomes into the same cell and...

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controlled pollination

Overview page. Subjects: Plant Sciences and Forestry — Ecology and Conservation.

A common practice in plant hybridization of bagging the pistillate flowers to protect them from undesired pollen. When the pistillate flowers are in a receptive condition, they are dusted...

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cross-breeding

Overview page. Subjects: Biological Sciences.

Usually, outbreeding or the breeding of genetically unrelated individuals. In animals it refers to the mating of individuals that are not consanguineous (see consanguinity).

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dihybrid

Overview page. Subjects: Genetics and Genomics — Psychology.

A cross between parents differing in two pairs of genes or two independently heritable characters. Also called a dihybrid cross. Compare hybrid (1). [From Greek dis twice + English hybrid]

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