During what stage of mitosis does the nuclear envelope disappear and the chromosomes become distinct? During prophase, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down.
During what stage of mitosis does the nuclear envelope disappear and the chromosomes become distinct quizlet?
During______, the nuclear envelope disappears, and the chromosomes become distinct. You just studied 10 terms!
In which two phases of mitosis does the nuclear membrane appear or disappear?
During prophase, the nucleus disappears, spindle fibers form, and DNA condenses into chromosomes ( sister chromatids ). During telophase, chromosomes arrive at opposite poles and unwind into thin strands of DNA, the spindle fibers disappear, and the nuclear membrane reappears.
What stage is cell cleaved into two?
M phase: Cell division, comprising mitosis, when a fully grown cell segregates the replicated chromosomes to opposite ends of a molecular scaffold, termed the spindle, and cytokinesis, when the cell cleaves between the separated chromosomes to produce two daughter cells.
Why do chromosomes condense before mitosis?
Chromosomes condense before mitosis to allow them the ability to move smoothly, without becoming entangled and breaking. (So, they are conveniently packaged for cell division, in which the chromosomes must move to both poles of the cell.)
Why does the nuclear membrane dissolve?
The nuclear envelope of metazoa breaks down at the onset of mitosis and reassembles at the end of mitosis. This process is mainly controlled by the cyclin-dependent kinase that phosphorylates inner nuclear membrane (INM) proteins to disrupt their association with chromatin and to disintegrate the nuclear lamina.
What would happen if the nuclear membrane did not dissolve?
What might happen if the nuclear envelope of a cell did not break down during mitosis? The cytoskeleton could not attach to the chromosomes and the mitotic spindle would not form.
What’s the relationship between crossing over and genetic variation?
Explanation: Crossing over is a process that happens between homologous chromosomes in order to increase genetic diversity. During crossing over, part of one chromosome is exchanged with another. The result is a hybrid chromosome with a unique pattern of genetic material.