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Backcrossing is a crossing of a hybrid with one of its parents or an individual genetically similar to its parent, to achieve offspring with a genetic identity closer to that of the parent. It is used in horticulture, animal breeding, and production of gene knockout organisms.
One of the ways crop species can be manipulated is by crossing them with wild type species. For instance, the wild wheat relative species Agropyron elongatum has been crossed and introgressed with the domesticated wheat Triticum aestivum. Consequently, the resulting hybrids have a higher water stress adaptation and higher root and shoot biomass.
To cross one's fingers is a hand gesture commonly used to wish for luck. Early Christians used the gesture to implore the protection of the Holy Cross. [ 1 ] The gesture is referred to by the common expressions "cross your fingers", "keep your fingers crossed", or just "fingers crossed".
Introgression is an important source of genetic variation in natural populations and may contribute to adaptation and even adaptive radiation. [7] It can occur across hybrid zones due to chance, selection or hybrid zone movement. [8]
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Subsequent generations may see a purebred animal crossed back on a crossbred, creating a 75/25 cross, [7] or a BC1 or F1b "backcross." [citation needed] The breeding of two crossbreeds of the same combination of breeds, creating an F2 cross, an animal that is still a 50–50 cross, but it is the second filial generation of the combination. [10]
Sitting with your legs nicely crossed is one thing, but this woman somehow managed to twist her legs around each other nearly three times!
Out-crossing or out-breeding is the technique of crossing between different breeds. This is the practice of introducing distantly related genetic material into a breeding line, thereby increasing genetic diversity .