Table of Contents
- 1 Why does meiosis occur in algae?
- 2 At which stage does meiosis occur?
- 3 Where does meiosis occur in red algae?
- 4 Does meiosis occur after zygote formation?
- 5 Does meiosis occur before puberty?
- 6 Does meiosis occur after mitosis?
- 7 At what stage does meiosis occur in an organism exhibiting haploid life cycle and mention the fate of the product thus produced?
- 8 What are algae How do algae reproduce?
- 9 What is the type of meiosis in algae?
- 10 When does meiosis take place in humans?
- 11 What is the dominant stage of sexually reproducing algae?
Why does meiosis occur in algae?
Option B: Algae has sporic meiosis and not gametic meiosis. Therefore, this is the incorrect option. Option C: In animals, gametic meiosis occurs….Thus, the correct option is C) Animals.
Sl.No | Gametic meiosis | Zygotic meiosis |
---|---|---|
4. | Example includes sexually reproducing organisms | Example includes lower plants |
At which stage does meiosis occur?
Organisms exhibiting the haploidic life cycle show meiosis at the zygote stage of their life cycle. Products of meiosis, in their life cycle, are haploid cells, which germinate/develop to produce new organisms.
Where does meiosis occur in haploid algae?
Organisms that are haploid, e.g. algae such as Volvox, Spirogyra, etc. show meiosis in the zygote. The haploid gametes fuse to produce a diploid zygote, which undergoes meiosis to produce haploid spores, which divide mitotically to produce gametophyte. A zygote is the only diploid stage in these haploid organisms.
Where does meiosis occur in red algae?
Some red algae (such as Bonnemaisonia and Lemanea) and green algae (such as Prasiola) have vegetative meiosis, also called somatic meiosis, which is a rare phenomenon. Vegetative meiosis can occur in haplodiplontic and also in diplontic life cycles. The gametophytes remain attached to and part of the sporophyte.
Does meiosis occur after zygote formation?
Fertilization establishes the regular diploid number of chromosomes in the zygote. Meiosis occurs over two cycles of cell division, which sperm cells complete before fertilization. At fertilization, meiosis II resumes and the duplicate copies of each chromosome are pulled apart.
Which method of reproduction takes place in algae?
Many small algae reproduce asexually by ordinary cell division or by fragmentation, whereas larger algae reproduce by spores.
Does meiosis occur before puberty?
In humans, meiosis is the process by which sperm cells and egg cells are produced. In the male, meiosis takes place after puberty.
Does meiosis occur after mitosis?
Meiosis contains two separate cell divisions, meaning that one parent cell can produce four gametes (eggs in females, sperm in males). Before entering meiosis I, a cell must first go through interphase. This is the same interphase that occurs before mitosis.
Does meiosis take place in conidia?
Some Gemmules and conidia are asexual structures, hence, meiosis does not take place.
At what stage does meiosis occur in an organism exhibiting haploid life cycle and mention the fate of the product thus produced?
Answer : Meiosis occurs in an organism exhibiting haploidic cycle after the zygote formation stage. Thus the product formed will be haploid spores which grow into haploid individuals.
What are algae How do algae reproduce?
Many small algae reproduce asexually by ordinary cell division or by fragmentation, whereas larger algae reproduce by spores. Some red algae produce monospores (walled, nonflagellate, spherical cells) that are carried by water currents and upon germination produce a new organism.
How Zoospores are formed in algae?
The zoospores are formed in reproductive body the zoosporangium. The zoospores can be biflagellate e.g., Chlamydomonas, biflagellate and quadriflagellate e.g., Ulothrix, Cladophora, multi-flagellate e.g., Oedogoniwn. Zoospores move in water before they germinate to make new plants.
What is the type of meiosis in algae?
Depending on the life cycle of algae meiosis may be zygotic, gametic or sporic. The algae having haplontic type of life cycle have zygotic meiosis. For example Chlamydomonas, Oedogonium, Volvox, Ulotrix etc. The algae having diplontic type of life cycle have gametic meiosis.
When does meiosis take place in humans?
It takes place whenever the organism has to produce daughter cells that have half the number of chromosomes as the parent cells. In humans, meiosis occurs in spermatogonial and oogonial cells to produce sperms and eggs respectively.
What happens to small gametes during meiosis?
The small diploid cells undergo meiosis, and among pennate (thin, elliptical) diatoms the resulting haploid gametes fuse into a zygote, which grows quite large and forms a special kind of cell called an auxospore. The auxospore divides, forming two large, vegetative cells, and in this manner the larger size is renewed.
What is the dominant stage of sexually reproducing algae?
The life cycles of sexually reproducing algae vary; in some, the dominant stage is the sporophyte, in others it is the gametophyte. For example, Sargassum (class Phaeophyceae) has a diploid (sporophyte) body, and the haploid phase is represented by gametes.