一いち代だい雑ざっ種しゅ

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Meanings

1

noun

F1 hybrid; first filial generation hybrid

Technical term in genetics and breeding for the first-generation offspring of two distinct parent lines. Often used in agriculture and horticulture.

one, one radical (no.1)

代substitute, change, convert

雑miscellaneous

種species, kind, class

雑ざっ種しゅ
雑種 is a general term for hybrid or crossbreed, while 一代雑種 specifically refers to the first filial (F1) generation.
F1
F1 is the common abbreviation used in seed packets and catalogs; 一代雑種 is the full Japanese term.

Compound of 一代 (one generation) and 雑種 (hybrid). The term directly translates the English 'F1 hybrid' or 'first filial generation'.