Diplontic Life Cycle
| This section does not cite any references or sources. |
In gametic meiosis, instead of immediately dividing meiotically to produce haploid cells, the zygote divides mitotically to produce a multicellular diploid individual or a group of more unicellular diploid cells. Cells from the diploid individuals then undergo meiosis to produce haploid cells or gametes. Haploid cells may divide again (by mitosis) to form more haploid cells, as in many yeasts, but the haploid phase is not the predominant life cycle phase. In most diplonts, mitosis occurs only in the diploid phase, i.e. gametes usually form quickly and fuse to produce diploid zygotes.
In the whole cycle, gametes are usually the only haploid cells, and mitosis usually occurs only in the diploid phase.
The diploid multicellular individual is a diplont, hence a gametic meiosis is also called a diplontic life cycle. Diplonts are:
- Animals
- Some brown algae
- Some fungi, e.g. brewer's yeast
Read more about this topic: Biological Life Cycle
Famous quotes containing the words life and/or cycle:
“The man who is aware of himself is henceforward independent; and he is never bored, and life is only too short, and he is steeped through and through with a profound yet temperate happiness. He alone lives, while other people, slaves of ceremony, let life slip past them in a kind of dream.”
—Virginia Woolf (1882–1941)
“Only mediocrities progress. An artist revolves in a cycle of masterpieces, the first of which is no less perfect than the last.”
—Oscar Wilde (1854–1900)