The stage in an organism's life cycle when it exists in a haploid state, with unpaired chromosomes.
From Greek 'haplous' (single) + 'phasis' (phase). Emerged in 20th-century biology to describe distinct life cycle stages.
Every organism with both haploid and diploid stages has a haplophase—it's like their 'single life phase,' and understanding these phases helped scientists finally explain why sex happens in nature!
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