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Haplodiplontic

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Biology for Non-STEM Majors

Definition

Haplodiplontic refers to a life cycle that includes both a multicellular haploid phase and a multicellular diploid phase. This dual-phase cycle is characteristic of many plants and some algae.

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5 Must Know Facts For Your Next Test

  1. The haplodiplontic life cycle involves alternation of generations, where each generation alternates between haploid (gametophyte) and diploid (sporophyte) stages.
  2. In the haplodiplontic lifecycle, the gametophyte produces gametes through mitosis, while the sporophyte produces spores through meiosis.
  3. Mosses and ferns exhibit a prominent gametophyte stage in their life cycles.
  4. Seed plants like angiosperms and gymnosperms primarily display a dominant sporophyte stage with reduced gametophytes.
  5. The transition from gametophyte to sporophyte involves fertilization, while the transition from sporophyte to gametophyte involves meiosis.

Review Questions

  • What are the two phases in the haplodiplontic life cycle?
  • How do mosses and ferns differ from seed plants in terms of their dominant life cycle stage?
  • What processes mark the transitions between the stages in the haplodiplontic life cycle?

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