What is isomorphic or heteromorphic alternation of generation?
In an isomorphic alternation of generations (found in some algae, for example) the sporophyte and gametophyte are morphologically similar or identical; in a heteromorphic alternation of generations they are dissimilar (e.g. in mosses the gametophyte is the dominant and conspicuous generation, whereas in higher plants …
What do you mean by Heteromorphic alternation of generation?
Heteromorphic alternation of generation occurs in organisms in which the haploid gametophyte phase and diploid sporophyte phase are different in form.
What is Diplontic alternation of generation?
Diplontic life cycle refers to the life cycle of organisms, which is dominated by the diploid stage. Plants and algae show alternation of generation. All the plants showing sexual reproduction alternate between two multicellular stages, viz. Haploid gametophyte and diploid sporophytes.
What is isomorphic type of life cycle?
Isomorphic type: In this type there are two exactly similar somatic phases (morphologically identical plants) showing alernaion of generations. Here the one phase is diploid (sporophyte 2n) while the other haploid (gametophyte n).
What is isomorphic alternation of generation explain it by the life cycle of Ectocarpus?
This typical life cycle of Ectocarpus exhibits morpholigically identical filaments representing sporophyte and gametophyte—isomorphic alternation of generations. While the one formed by the direct germination of the zygote bearing unilocular sporangia and plurilocular sporangia is the sporophyte having diploid cells.
What does the word Heteromorphic mean?
1 : deviating from the usual form. 2 : exhibiting diversity of form or forms heteromorphic pairs of chromosomes.
What is difference between Haplontic and Diplontic?
The main difference between haplontic and diplontic life cycle is that the main form of the haplontic life cycle is haploid and its diploid zygote is formed for a short period of time whereas the main form of the diplontic life cycle is diploid, which produce gametes.
What is Diplobiontic?
Adjective. diplobiontic (not comparable) (botany) Describing a plant or fungus where both the haploid and diploid phases are represented by a multicellular phase. All embryophytes are diplobiontic.
What is life cycle has alternation of generations?
Alternation of generations (also known as metagenesis) is the type of life cycle that occurs in those plants and algae in the Archaeplastida and the Heterokontophyta that have distinct haploid sexual and diploid asexual stages.
What type of reproduction is alternation of generations?
Alternation of generations is a type of life cycle found in terrestrial plants and some algae in which subsequent generations of individuals alternate between haploid and diploid organisms. This can be contrasted to sexual reproduction in animals, in which both haploid and diploid cells are found in every generation.
How do you explain alternation of generations?
Alternation of generations, also called metagenesis or heterogenesis, in biology, the alternation of a sexual phase and an asexual phase in the life cycle of an organism . The two phases, or generations, are often morphologically, and sometimes chromosomally, distinct.
What is the significance of alternation of generations?
Alternation of generation is very significant because:It promotes the chances of survival of organisms.The populations become increasingly better adapted to environment. Better chance for survival: During the formation of spores from spore mother cells by meiotic division reshuffling of genes occurs.
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