Alternation of generations
Definition
Alternation of generations is a life cycle in which organisms alternate between two distinct multicellular stages, haploid (gametophyte) and diploid (sporophyte). This cycle is common in plants, algae, and some fungi.
5 Must Know Facts For Your Next Test
- 1. In the alternation of generations, the gametophyte produces gametes through mitosis.
- 2. The sporophyte phase begins with the fusion of gametes to form a zygote.
- 3. Sporophytes produce spores via meiosis, which then develop into new gametophytes.
- 4. This life cycle ensures genetic diversity through both sexual and asexual reproduction stages.
- 5. Mosses and ferns are classic examples of plants exhibiting alternation of generations.
Review Questions
- 1. What are the two main stages in the alternation of generations life cycle?
- 2. How do sporophytes produce spores?
- 3. Why is alternation of generations important for genetic diversity?
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Related terms
Haploid: A cell or organism having a single set of chromosomes, typically found in gametes
Diploid: A cell or organism having two sets of chromosomes, one from each parent
Gametophyte: The haploid multicellular stage that produces gametes in the alternation of generations
