Animalscaretips
Among animals, many invertebrates have an alternation of sexual and asexual generations (e.g., protozoans, jellyfish, flatworms), but the alternation of haploid and diploid generations is unknown. Life cycle of the common jellyfish Aurelia.
- Are animals alternation of generations?
- Do parasitic animals undergo alternation of generations?
- Do jellyfish have alternation of generations?
- In which group of animal phyla alternation of generation is present?
- When can you say that plants undergo alternation of generations?
- What is an example of alternation of generations?
- Do gymnosperms and angiosperms still have an alternation of generations?
- Do Pteridophytes have alternation of generations?
- Does Plasmodium have alternation of generations?
- Is Jelly a medusa or polyp?
- What is a medusa stage?
- Is medusa an animal?
- What is polyp and medusa?
- Does Aurelia alternation of generation?
- What is the process of alternation of generations?
Are animals alternation of generations?
Alternation between a multicellular diploid and a multicellular haploid generation is never encountered in animals. In some animals, there is an alternation between parthenogenic and sexually reproductive phases (heterogamy).
Do parasitic animals undergo alternation of generations?
The phenomenon occurs in some protoctists, certain lower animals (e.g. cnidarians and parasitic flatworms), and in plants. The malaria parasite (Plasmodium), for example, has a complex life cycle involving the alternation of sexually and asexually reproducing generations.
Do jellyfish have alternation of generations?
True jellyfish have a complex life cycle that allows them to quickly take advantage of favorable environmental conditions. This is achieved by alternating with each generation between reproducing sexually (with sperm fertilizing eggs) and asexually (by cloning themselves).
In which group of animal phyla alternation of generation is present?
In the phylum Cnidaria, class Hydrozoa has many groups that have alternation of generations.
When can you say that plants undergo alternation of generations?
The sporophyte is a multicellular organism formed from multiple rounds of mitosis on the zygote. Thus, the sporophyte individual remains a 2n organism. Then, when the sporophyte reaches maturity, a key point in the alternation of generations takes place.
What is an example of alternation of generations?
The classic example is the mosses, where the green plant is a haploid gametophyte and the reproductive phase is the brown diploid sporophyte. The two forms occur together. In bryophytes and mosses, the gametophyte is the dominant generation and the sporophyte are sporangium bearing stalks growing from the gametophyte.
Do gymnosperms and angiosperms still have an alternation of generations?
As for all plants, the key to understanding the life cycle of angiosperms is their evolutionary history of alternation of generations. Like gymnosperms and early vascular plants, angiosperms have a dominant, diploid sporophyte stage.
Do Pteridophytes have alternation of generations?
Pteridophytes show a true alternation of generations. Here, the dominant sporophyte produces spores through meiosis. The gametophyte generation forms gametes by mitosis.
Does Plasmodium have alternation of generations?
The zygote develops into a plasmodium, and the mature plasmodium produces, depending on the species, one to many fruiting bodies containing haploid spores. ... Some species of red algae have a complex triphasic alternation of generations. Kelp are an example of a brown alga with a heteromorphic alternation of generations.
Is Jelly a medusa or polyp?
Jellyfish have a stalked (polyp) phase, when they are attached to coastal reefs, and a jellyfish (medusa) phase, when they float among the plankton. The medusa is the reproductive stage; their eggs are fertilised internally and develop into free-swimming planula larvae.
What is a medusa stage?
Medusa is a mobile life cycle stage of the species belonging to the Cnidaria phylum. Species of the Hydrozoa class exist in medusa form or jellyfish. Morphologically, a medusa is formed by a bell capable of muscular contractions which enables the medusa to swim.
Is medusa an animal?
medusa, in zoology, one of two principal body types occurring in members of the invertebrate animal phylum Cnidaria. It is the typical form of the jellyfish. The medusoid body is bell- or umbrella-shaped.
What is polyp and medusa?
There are two basic cnidarian body shapes: a polyp form, which is attached to a surface; and an upside-down free-floating form called a medusa. Some cnidarians change form at different phases of their life cycle, while others remain in one form for their entire life.
Does Aurelia alternation of generation?
Aurelia undergoes alternation of generations, whereby the sexually-reproducing pelagic medusa stage is either male or female, and the benthic polyp stage reproduces asexually.
What is the process of alternation of generations?
Alternation of generations describes a plant's life cycle as it alternates between a sexual phase, or generation and an asexual phase. The sexual generation in plants produces gametes, or sex cells and is called the gametophyte generation. The asexual phase produces spores and is called the sporophyte generation.
