homologue

/ˈhɑməˌlɔɡ/
noun
  1. A thing that is homologous to another; something that corresponds in structure, position, or origin.
    • The human arm is a homologue of the bat wing.
    • The word 'brother' in English is a homologue of 'frère' in French.
    • In chemistry, methane is a homologue of ethane in the alkane series.
  2. In genetics, one of a pair of chromosomes that carry the same genes in the same order.
    • During cell division, each homologue separates into a different daughter cell.
    • The scientist identified a mutation on one homologue but not the other.
    • Each homologue carries one copy of the gene for eye color.
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