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An F1 hybrid (or filial 1 hybrid) is the first filial generation of offspring of distinctly different parental types. F1 hybrids are used in genetics, and in selective breeding, where it may appear as F1 crossbreed. The term is sometimes written with a subscript, as F1 hybrid.
Details: 2015 Toyota Avalon Hybrid. The front-wheel drive 2015 Toyota Avalon Hybrid comes with a 2.5-liter four-cylinder engine and an electric motor, which are paired with a continuously variable transmission (CVT).The Avalon Hybrid comes in three trims: XLE Premium, XLE Touring and Limited. The gas-only Avalon is reviewed separately.etails: 2015 Toyota Avalon Hybrid. The front-wheel drive 2015 Toyota Avalon Hybrid comes with a 2.5-liter four-cylinder engine and an electric motor, which are paired with a continuously variable transmission (CVT).