Dictionary > Prometaphase

Prometaphase

Definition
noun
The phase of mitosis between prophase and metaphase wherein the nuclear envelope breaks down and form membrane vesicles, chromatin condenses forming chromatids, and kinetochore forms around the centromere
Supplement
Prometaphase is that phase in mitosis in between prophase and metaphase. It takes place after prophase and preceding metaphase of a dividing eukaryotic cell. However, prometaphase is sometimes considered as part of the prophase, particularly towards the end and prior to metaphase.
During this stage, the nuclear membrane breaks down and forms numerous membrane vesicles. The seeming disappearance of the nuclear envelope marks the beginning of prometaphase. The breakdown of the nuclear membrane allows the chromatin structures to condense and thicken into chromatids. Another highlight of the prometaphase is the formation of proteins into a kinetochore around the centromere. The kinetochore is important as it joins the sister chromatids at the central point (centromere). Kinetochore microtubules emerging from the centrosomes (which are located at opposite ends of a dividing cell) attach to the kinetochores. 1 After the events of prometaphase is the next phase of mitosis, which is the metaphase.
Word origin: Latin or Greek prĂ³ (before) + metaphase
See also:

Reference(s):

1“prometaphase”. Nature Education. http://www.nature.com/scitable/definition/prometaphase-281


You will also like...

Genetic Mutations
Chromosome Mutations – II

This tutorial is a continuation of the first lesson on chromosomal mutation. Here, find out the chromosomal aberrations ..

Schematic diagram of bacterial lactose operon
Gene Action – Operon Hypothesis

Learn how the way genes control and determine every aspect of the body. This lesson uses lac operon as an example. ..

..

Protein (illustration)
Protein Variety

The sequence of amino acids determines the type of protein. Protein is synthesized according to the sequence of nucleoti..

Freshwater lake ecosystem
Freshwater Producers and Consumers

Freshwater ecosystem is comprised of four major constituents, namely elements and compounds, plants, consumers, and deco..

Birth Control and Contraception
Birth Control and Contraception

Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..

Still Water Community Plants
Still Water Community Plants

This tutorial looks at the adaptations of freshwater plants for them to thrive in still water habitats. Familiarize your..