対たい立りつ遺い伝でん子し

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Meanings

1

noun

genetics

Technical term in genetics; one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.

遺い伝でん子し
遺伝子 means 'gene' in general, while 対立遺伝子 specifically refers to an allele, a variant form of a gene.
アレル
アレル is the katakana loanword for 'allele', used interchangeably with 対立遺伝子 in scientific contexts.

Compound of 対立 (opposition) and 遺伝子 (gene), calque of German 'Allel' or English 'allele'.