1902, in the meaning defined above
allelo- + -morph
The term was introduced by the English biologist William Bateson (1861-1926) in Mendel's Principles of Heredity: A Defence (Cambridge, 1902), p. 27.
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“Allelomorph.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/allelomorph. Accessed 18 Apr. 2021.
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