What is the simple 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 are the steps of prophase?
Prophase is the first stage of mitosis. In prophase, chromosomes condense and become visible. spindle fibers emerge from the centrosomes.
- chromosomes continue to condense.
- kinetochores appear at the centromeres.
- mitotic spindle microtubules attach to kinetochores.
- centrosomes move toward opposite poles.
What is prophase 1 called?
Prophase 1 of Meiosis is the first stage of meiosis and is defined by five different phases; Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis (in that order).
What is metaphase in simple words?
Metaphase is a stage in the cell cycle where all the genetic material is condensing into chromosomes. These chromosomes then become visible. During this stage, the nucleus disappears and the chromosomes appear in the cytoplasm of the cell.
What are the 5 stages of prophase?
Meiotic prophase I is subdivided into five stages: leptotene, zygotene, pachytene, diplotene, and diakinesis.
What 3 things happen during prophase?
The first and longest phase of mitosis is prophase. During prophase, chromatin condenses into chromosomes , and the nuclear envelope, or membrane, breaks down. In animal cells, the centrioles near the nucleus begin to separate and move to opposite poles (sides) of the cell.
What happens in the prophase of meiosis?
During prophase I, the complex of DNA and protein known as chromatin condenses to form chromosomes. … A large structure called the meiotic spindle also forms from long proteins called microtubules on each side, or pole, of the cell. Between prophase I and metaphase I, the pairs of homologous chromosome form tetrads.
Which of the following events occurs during prophase?
During prophase, the chromosomes condense and centrosomes move to opposite sides of the nucleus, initiating formation of the mitotic spindle. Breakdown of the nuclear envelope then allows spindle microtubules to attach (more…)
What is a major feature of prophase in mitosis?
Mitosis begins at prophase with the thickening and coiling of the chromosomes. … The end of prophase is marked by the beginning of the organization of a group of fibres to form a spindle and the disintegration of the nuclear membrane.