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Anisogamy (the opposite of isogamy) comes from the ancient Greek negative prefix a(n)-(alpha privative), the Greek adjective isos (meaning equal) and the Greek verb gameo (meaning to have sex/to reproduce), eventually meaning "non-equal reproduction" obviously referring to the enormous differences between male and female gametes in size and abilities. [10]
Sexual reproduction is the most common life cycle in multicellular eukaryotes, such as animals, fungi and plants. [6] [7] Sexual reproduction also occurs in some unicellular eukaryotes. [2] [8] Sexual reproduction does not occur in prokaryotes, unicellular organisms without cell nuclei, such as bacteria and archaea.
This cell diagram was created with Inkscape. ... Description=Different types of en:anisogamy: *A) Anisogamy of motile gametes *B) Oogamy (non-motile egg cell, ...
Diagram of a human sperm cell. Sperm (pl.: sperm or sperms) is the male reproductive cell, or gamete, in anisogamous forms of sexual reproduction (forms in which there is a larger, female reproductive cell and a smaller, male one).
Oogamy is a common form of anisogamy, with almost all animals and land plants being oogamous. Oogamy is found in most sexually reproducing species, including all vertebrates, land plants, and some algae. The ancestral state of sexual reproduction is believed to be isogamy, with oogamy evolving through anisogamy.
It is generally accepted that isogamy is an ancestral state for anisogamy [1] [9]. Isogamous reproduction evolved independently in several lineages of plants and animals into anisogamy (species with gametes of male and female types) and subsequently into oogamy (species in which the female gamete is much larger than the male and has no ability ...
Members of this phylum also exhibit a form of sexual reproduction known as anisogamy. [4] Anisogamy is the fusion of two sexual gametes that differ in morphology, usually size. [ 5 ] In Allomyces , the thallus (body) is attached by rhizoids , and has an erect trunk on which reproductive organs are formed at the end of branches.
Chlamydomonas's asexual reproduction occurs by zoospores, aplanospores, hypnospores, or a palmella stage, [14] while its sexual reproduction is through isogamy, anisogamy or oogamy. Nutrition [ edit ]