What kind of development takes place in the zygote in organisms with diplontic and haplo-diplontic life cycles
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diplontic
In this type of life cycle, Diploid zygote, germinates by mitosis to form unicellular or multicellular diploid sporophyte.All seed- bearing plants i.e. gymnosperms and angiosperms, follow this pattern.
Haplontic life cycle:
In most of the plants, the zygote undergoes mitotic cell division and produces diploid sporophytes. The sporophyte divides meiotically to produce haploid spores. These spores again undergo mitotic cell division and produce haploid gametophytes. This gametophyte produces gametes by mitosis. This type of life cycle is known as Haplodiplontic Life Cycle.
In this type of life cycle, Diploid zygote, germinates by mitosis to form unicellular or multicellular diploid sporophyte.All seed- bearing plants i.e. gymnosperms and angiosperms, follow this pattern.
Haplontic life cycle:
In most of the plants, the zygote undergoes mitotic cell division and produces diploid sporophytes. The sporophyte divides meiotically to produce haploid spores. These spores again undergo mitotic cell division and produce haploid gametophytes. This gametophyte produces gametes by mitosis. This type of life cycle is known as Haplodiplontic Life Cycle.
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refer to the photos
Explanation
In diplotic life cycle
Zygote undergoes mitosis because it has to maintain 2n number of chromosome
because it goes like
Sporophytes 2n
/ meiosis
Spores n
/ mitosis
Gametophyte n
/gametogenesis
Zygote 2n
/ mitosis
Sporophytes 2n
In haplo diplotic life cycle
Zygote undergoes mitosis because it has to maintain the 2n set of chromosomes.
So that it will be --
Sporophytes 2n
/ meiosis
Spores 2n
/ mitosis
Gametophyte n
/ gametogenesis
mitosis
Zygote 2n
/ mitosis
Sporophytes 2n
/
*repeat*
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