Genetic

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mid 19th century (in genetic (sense 2)): from genesis, on the pattern of pairs such as antithesis, antithetic .

wiktionary

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Coined from genesis [1], similarly to antithesis, antithetic. [2] Ultimately from Ancient Greek γίγνομαι(gígnomai, “I come into being”). Equivalent to gene +‎ -ic.

etymonline

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genetic (adj.)

1831, "pertaining to origins," coined by Carlyle as if from Greek genetikos from genesis "origin" (see genesis). Darwin used it biologically as "resulting from common origin" (1859); modern sense of "pertaining to genetics or genes" is from 1908 (see gene). Related: Genetically. Genetical is attested from 1650s as "pertaining to origins."