单词	amitotic
释义	amitotic /ˌeɪmʌɪˈtɒtɪk / /ˌamʌɪˈtɒtɪk/ adjective Biology Relating to or denoting the division of a cell nucleus without mitosis.Changes in the structure and ultrastructure of protoplasts during regeneration of the cell wall, mitotic cell division and amitotic nuclear fragmentation.... Tetrahymena divide by binary fission during vegetative growth, and the micronucleus and macronucleus are propagated by mitotic and amitotic division, respectively. As a result, the normal complement of DNA in the micronucleus is 4C during the amitotic division of the macronucleus and cytokinesis. Derivatives amitosis noun ... Not surprisingly, macronuclei divide by amitosis (except within the class Karyorelictea, in which macronuclear division does not occur). Two new micronuclei have formed in what would soon become daughter cells, the macronucleus has undergone amitosis, and Cytokinesis is progressing as the cleavage furrow becomes defined. Besides amitosis, cold-pretreatment also induced some abnormal mitotic behavior leading to the formation of micronuclei. amitotically adverb ... In contrast, the somatic macronucleus is polyploid, divides amitotically, and is actively transcribed. In contrast, the macronucleus serves as the somatic nucleus, divides amitotically, contains multiple copies of most genes, and is transcriptionally active. The MAC divides amitotically, resulting in a random distribution of chromosome copies.
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