Questions and Answers
What is a Diplontic Life Cycle?
In gametic meiosis, the zygote divides mitotically to produce multicellular diploid individuals, and haploid cells are produced from diploid individuals.
What is another name for a Gametic Life Cycle?
Diplontic
Explain a Gametic Life Cycle.
In a Gametic Life Cycle, the main stage of an organism's life is diploid (2n).
In a Gametic Life Cycle, which stage does the organism spend most of its life in?
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What are some examples of organisms that have a Gametic Life Cycle?
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Is the haploid stage of a diplontic life cycle unicellular or multicellular?
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What ploidy are gametes in a Gametic Life Cycle?
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In a Gametic Life Cycle, after gametes undergo fertilization, what is formed?
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In a Gametic Life Cycle, is the zygote unicellular or multicellular?
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After a zygote is formed, what process occurs and what is produced?
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In a Gametic Life Cycle, what process produces gametes?
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What is a Haplontic Life Cycle?
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In a Zygotic Life Cycle, which stage does the organism spend most of its life in?
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Explain a Zygotic Life Cycle.
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What organisms have a Haplontic Life Cycle?
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In what environment do organisms with a Haplontic life cycle live, and why?
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Is the Haplontic Life Cycle mostly unicellular or multicellular?
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In the haplontic life cycle, through what process are gametes formed?
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In a Haplontic Life Cycle, after meiosis, what is the next stage, and what is produced?
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In a Haplontic Life Cycle, once a multicellular haploid organism is produced, what is the next stage and what is produced?
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In a Haplontic Life Cycle, after gametes are formed, what occurs and what is formed?
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Study Notes
Diplontic Life Cycle
- Characterized by gametic meiosis, where zygotes undergo mitosis to form multicellular diploid organisms.
- Diploid individuals produce haploid gametes via meiosis; haploid phase is less prominent.
- Gametes (haploid, n) are typically the only haploid cells in the cycle.
- Organisms mainly include animals and some algae.
Haplontic Life Cycle
- Zygotic meiosis occurs immediately after the fusion of two cell nuclei (karyogamy).
- Produces several haploid cells after the diploid phase ends, which can divide mitotically.
- The cycle features zygotes as the sole diploid cells, with mitosis occurring in haploid individuals.
- Examples include most fungi and some algae, such as Volvox and dinoflagellates.
- Organisms thrive in dark, wet environments to avoid the harmful effects of ultraviolet light.
Life Cycle Characteristics
- Haplontic organisms primarily exist in a multicellular haploid form.
- Gametes are produced through mitosis, leading to a multicellular haploid stage before fertilization occurs.
- Upon fertilization, a unicellular diploid zygote is formed, initiating the diploid phase.
Key Processes
- In the Diplontic cycle, the zygote undergoes mitosis producing a multicellular diploid organism.
- In the Haplontic cycle, after meiosis, mitosis creates multicellular haploid organisms.
- Fertilization in both cycles leads to the formation of the zygote, but the duration and characteristics of the diploid phase differ markedly.
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Description
Explore the key concepts of diplontic, haplontic, and haplodiplontic life cycles with this set of flashcards. Understand how gametic meiosis leads to the formation of multicellular diploid individuals and the significance of haploid cells in these cycles.
