All Sources -
Updated Media sources (1) About encyclopedia.com content Print Topic
prophase The first phase of mitosis and meiosis I and meiosis II. In mitosis and the first division of meiosis the chromosomes become visible within the nucleus, coiling up to produce a series of compact spirals. In meiosis I they also undergo pairing during this phase, the phase then being divided into 5 successive stages: leptotene, zygotene, pachytene, diplotene, and diakinesis. The prophase of the second division of meiosis (prophase II) is very similar to prophase of mitosis: the nucleoli and nuclear membrane break down and the chromatids shorten and thicken. Many plants go directly from anaphase I to metaphase II and do not have a prophase II.
prophase The first stage of cell division, during which chromosomes contract and divide along their length (except for the centromeres) into chromatids. In mitosis, the chromosomes remain separate from each other. In the first division of meiosis, homologous chromosomes become paired (see pairing). By the end of first prophase the two chromosomes begin to move apart.
prophase The first phase of mitosis and meiosis, divided into prophase I and prophase II, during which the chromosomes become visible within the nucleus, coiling up to produce a series of compact spirals. In the first division of meiosis they also undergo pairing during this phase, the phase then being divided into five successive stages: leptotene, zygotene, pachytene, diplotene, and diakinesis.
More From encyclopedia.com
Divide , di·vide / diˈvīd/ • v. 1. separate or be separated into parts: [tr.] consumer magazines can be divided into a number of different categories | [intr.… Spermatocyte , spermatocyte A diploid cell that undergoes meiosis and forms four spermatids. A primary spermatocyte undergoes the first meiotic division to form two… Sporozoa , The fifth Phylum of the Protist Kingdom, known as Apicomplexa, gathers several species of obligate intracellular protozoan parasites classified as Sp… Gametophyte , A gametophyte, or gamete-bearing plant, is one of the two multicellular phases that occur in alternation of generations. The gametophyte is the haplo… Chromatography , Chromatography is a family of laboratory techniques for separating mixtures of chemicals into their individual compounds. The basic principle of chro… Bereavement , Bereavement is defined as the objective state of having experienced the loss of a loved one. Grief, in contrast, is the psychological and emotional r…
You Might Also Like