cross

1. Any figure in the shape of a c. formed by two intersecting lines. SYN: crux. 2. SYN: crux of heart. 3. A method of hybridization or the hybrid so produced. [F. croix, L. crux]

- back c. the mating between an animal that is homozygous at a locus of interest and an animal that is heterozygous, commonly from the same ancestral stock.

- double back c. a mating that is a back c. at each of two loci of interest; of special value and importance in linkage analysis.

- hair crosses [TA] crosslike figures formed by hairs growing from two directions that meet and then separate in a direction perpendicular to the original orientation. SYN: cruces pilorum [TA].

- maltese c. a tetrad formation of the early ringlike parasites within the red blood cell seen in babesiosis.

- Ranvier crosses black or brown figures in the shape of a c., marking Ranvier nodes in the longitudinal section of a nerve stained with silver nitrate.

- test c. in experimental genetics, a deliberate mating designed to test claims about the pattern of inheritance of one or more traits.

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cross 'krȯs n

1) a device composed of an upright bar traversed by a horizontal one

2 a) an act of crossing dissimilar individuals

b) a crossbred individual or kind

cross vt to cause (an animal or plant) to interbreed with one of a different kind: HYBRIDIZE <the \crossing of two cattle breeds> vi INTERBREED, HYBRIDIZE

cross adj CROSSBRED, HYBRID

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(kros) [L. crux] 1. any figure or structure in the shape of a cross. 2. the production of progeny containing genetic information from two or more parents, as by mating between genetically different individuals, conjugation between microorganisms of different mating types, or recombination between viral particles of different genotypes. 3. the progeny derived from two or more parents of different genetic backgrounds.