{"id":841,"date":"2023-12-11T20:49:00","date_gmt":"2023-12-11T20:49:00","guid":{"rendered":"https:\/\/cellandcelldivision.com\/?p=841"},"modified":"2024-02-16T23:54:21","modified_gmt":"2024-02-16T23:54:21","slug":"page-204","status":"publish","type":"post","link":"https:\/\/cellandcelldivision.com\/?p=841","title":{"rendered":"Page 204"},"content":{"rendered":"\n

al., 1978; Ghosh, Paweletz, 1984; Stephenson, Gooday, 1984;
Petrashchuk, Onishchenko, 1987, etc.). It should be noted that their
interpretations are not unidirectional and in most cases they are considered
as unusual phenomena or exceptions. Some of the above mentioned
authors (Johnson, Rao, 1971; Ghosh et al., 1978; Ghosh, Paweletz, 1984)
try to find the reasons for these \u201cexceptions\u201d in differences in size, nature
and origin of the nuclei, non-optimal conditions of the nutrative regimen, in
metabolism, compartmentalization of the cytoplasm and their like.
Until recently the observed cytological pictures of asynchronous
division caused a perplexity. In his book \u201cMitosis and Physiology of Cell
Division\u201d D. Mazia (1963) considers \u201cunusual phenomenon\u201d the
registered by Haque (1953) asynchronous division of nuclei in one of the
two binucleate cells, representing pollen grains of Tradescantia paludosa<\/em>
(Fig. 3\u201328). In confirmation of his opinion he cites the words of Holden
and Mota (1956) that \u201ceven in unusual cases, when two nuclei in the cell
undergo mitotic divisions with a different speed, they can enter in
prophase simultaneously\u201d.<\/p>\n\n\n\n

image<\/p>\n\n\n\n

image<\/p>\n\n\n\n

Figure 3\u201328. Synchronous (A) and asynchronous (B) mitosis in \nbinucleate pollen grains of Tradescantia paludosa<\/em> (After Haque, 1953; \nFrom Mazia, 1963). <\/pre>\n\n\n\n
Peshkov and Rodionova (1964) have also registered a cell with two
nuclei, which are in different phases of division. After that Peshkov (1966)
analyzing the peculiarities of cytology and karyology of some unicellular
and multicellular green algae considers a mistake the interpretation of this
figure, given in their earlier work, where they have described it as a single
metaphase plate, and actually these are two separate groups of
chromosomes in different mitotic phases. As a result of this analysis he
has supposed that in Chlorella vulgaris<\/em> during the transition to prophase
the mitotic division can proceed asynchronously. Nevertheless, after that
this great researcher emphasizes that divisions occur synchronously, one
after another, passing through the individual mitotic phases up to the<\/p>\n","protected":false},"excerpt":{"rendered":"
al., 1978; Ghosh, Paweletz, 1984; Stephenson, Gooday, 1984;Petrashchuk, Onishchenko, 1987, etc.). It should be noted that theirinterpretations are not unidirectional and in most cases they are consideredas unusual phenomena or exceptions. Some of the above mentionedauthors (Johnson, Rao, 1971; Ghosh et al., 1978; Ghosh, Paweletz, 1984)try to find the reasons for these \u201cexceptions\u201d in differences […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[6],"tags":[],"class_list":["post-841","post","type-post","status-publish","format-standard","hentry","category-book"],"_links":{"self":[{"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=\/wp\/v2\/posts\/841","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=841"}],"version-history":[{"count":1,"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=\/wp\/v2\/posts\/841\/revisions"}],"predecessor-version":[{"id":849,"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=\/wp\/v2\/posts\/841\/revisions\/849"}],"wp:attachment":[{"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=841"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=841"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cellandcelldivision.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=841"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}