What is the simple definition of prophase?
Definition of prophase 1 : the initial stage of mitosis and of the mitotic division of meiosis characterized by the condensation of chromosomes consisting of two chromatids, disappearance of the nucleolus and nuclear membrane, and formation of mitotic spindle.
What is the best description of the prophase?
prophase. / (ˈprəʊˌfeɪz) / noun. the first stage of mitosis, during which the nuclear membrane disappears and the nuclear material resolves itself into chromosomesSee also metaphase, anaphase, telophase.
What is a sentence for prophase?
the first stage of mitosis. 1, Prophase, then, is the build-up to mitosis-or, at least, the visible part of the build-up. 2, Do you mind if I look? It’s prophase.
What is the defining event of telophase?
During telophase, the chromosomes begin to decondense, the spindle breaks down, and the nuclear membranes and nucleoli re-form. The cytoplasm of the mother cell divides to form two daughter cells, each containing the same number and kind of chromosomes as the mother cell.
Why is the prophase important?
Prophase I highlights the exchange of DNA between homologous chromosomes via a process called homologous recombination and the crossover at chiasma(ta) between non-sister chromatids. Thus, this stage is important to increase genetic variation.
What is another name for prophase?
n. diplotene, diakinesis, pachytene, synezesis, zygotene, leptotene, synizesis.
What is late prophase?
Late prophase, or prometaphase, begins with the disruption of the nuclear envelope, which is broken down into small membrane vesicles that closely resemble the endoplasmic reticulum and tend to remain visible around the mitotic spindle.
How is prophase I different from prophase II in meiosis?
The key difference between prophase I and prophase II is that the prophase I is the beginning phase of meiosis I, and there is a long interphase before it while the prophase II is the first phase of meiosis II without an interphase prior to it.
What is prophase in mitosis?
Prophase is the first phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells. During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses.
What 3 things happen during prophase?
The main events of prophase are: the condensation of chromosomes, the movement of the centrosomes, the formation of the mitotic spindle, and the beginning of nucleoli break down.
How is prophase regulated?
Regulation of the Cell Cycle During mitotic prophase, chromosome structures are again altered by a complex called condensin, which serves to package chromosomes before mitotic division. The mitotic spindle also forms during prophase.
Why is prophase important?
What is prophase in biology?
Prophase is the initial stage when cells divide, the nuclear envelop vanishes, and chromosomes become observable. Learn the definition and review the stages of prophase. Explore mitosis and meiosis, understand their roles in prophase, and recognize how they differ.
What is prophase 1 of meiosis 1?
Definition. Prophase I of meiosis I is a process that involves five different stages during which genetic material in the form of alleles crosses over and recombines to form non-identical haploid chromatids. Prophase I is the first stage of meiosis I, followed by prophase II, anaphase I, anaphase II, metaphase I and metaphase II.
What happens to the membrane during prophase II?
If a membrane has formed around the chromosomes at the end of the first division, it disappears during prophase II. See more at meiosis mitosis. The American Heritage® Science Dictionary Copyright © 2011.
What is metaphor?
English Language Learners Definition of metaphor : a word or phrase for one thing that is used to refer to another thing in order to show or suggest that they are similar : an object, activity, or idea that is used as a symbol of something else