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Questions and Answers
What is the unique characteristic of plant life cycles?
What is the diploid stage of a plant called?
What is the purpose of alternation of generations in plants?
What is the difference between plants and animals in terms of their haploid phase?
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What is true about all plants in terms of their life cycle?
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What is the role of meiosis in the life cycle of plants?
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What is the term used to describe the number of sets of chromosomes in a cell?
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What is the dominant stage in the life cycle of bryophytes?
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What is the result of fertilization in the life cycle of plants?
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What is the characteristic of diploid cells?
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What is the main difference between bryophytes and more complex plants in terms of their life cycle?
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What is the function of the gametophyte stage in the life cycle of plants?
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What is the ploidy of the cells in the sporophyte stage?
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What is the purpose of the sporangium in the life cycle of plants?
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What is the difference between the type of cell division that occurs in the gametophyte stage and the sporophyte stage?
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Study Notes
Alternation of Generations in Plants
- Alternation of generations is a unique life cycle found in plants, where they alternate between two different stages of life: diploid (sporophyte) and haploid (gametophyte).
- Each generation of the plant looks like its grandparent, not its parent.
Diploid and Haploid Stages
- Diploid (sporophyte) stage: 2n, has two sets of chromosomes, one from each parent.
- Haploid (gametophyte) stage: n, has one set of chromosomes.
- Diploid sporophyte cells contain one set of chromosomes from each parent.
- Haploid gametophyte cells contain only one set of chromosomes.
Alternation of Generation Life Cycle
- The life cycle starts with a diploid sporophyte, which produces spores through meiosis.
- The spores develop into a haploid gametophyte, which produces gametes (sex cells).
- Two gametes of opposite sex unite in fertilization, forming a diploid zygote.
- The zygote grows into a diploid sporophyte, and the cycle begins again.
Gametophyte Stage
- The gametophyte stage is the haploid stage, which produces gametes (sex cells).
- It begins as a spore, which grows into a multi-celled organism through mitosis.
- The gametophyte stage can be independent and survive outside the plant.
Sporophyte Stage
- The sporophyte stage is the diploid stage, which grows from the fusion of male and female sex cells.
- It produces spores through meiosis, which contain one set of chromosomes.
- The sporophyte stage can be dominant in some plants, such as ferns and angiosperms.
Evolution of Alternation of Generation
- In bryophytes, the gametophyte stage is dominant, and the sporophyte stage is temporary.
- In more complex plants, such as ferns and angiosperms, the sporophyte stage is dominant, and the gametophyte stage is small and temporary.
- As plants evolved, the gametophyte stage became smaller and less long-lived, and the diploid sporophyte stage became the dominant life stage.
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Description
Explore the unique life cycle of plants, where each generation alternates between two distinct stages. Understand the fascinating process of Alternation of Generations in plant life cycles.
