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A breed or an animal produced from parents of different breeds; a new variety, as of plants, combining the qualites of two parent varieties or stocks.

The result of crossing a native stock with some better breed. If the crossbreed have more than three fourths of the better blood, it is called high grade. At grade, on the same level; -- said of the crossing of a railroad with another railroad or a highway, when they are on the same level at the point of crossing. --…

m cells both bearing this factor, is TT; a dwarf, being without T, is tt. Crossing these, crossbreeds, Tt, result (called generation F1). In the formation of the germ cells of these crossbreeds a process of segregation occurs such that germ cells, whether male or female, are produced of two kinds, T and t, in equal num…