Which phase of the cell cycle is characterized by the disintegration of the nuclear envelope?
The cells of higher eukaryotes, however, usually undergo open mitosis, which is characterized by breakdown of the nuclear envelope. The daughter chromosomes then migrate to opposite poles of the mitotic spindle, and new nuclei reassemble around them.
In which stage of mitosis do you see formation of the mitotic spindle?
The mitotic spindle also begins to develop during prophase. As the cell’s two centrosomes move toward opposite poles, microtubules gradually assemble between them, forming the network that will later pull the duplicated chromosomes apart.
What three phases are individual chromosomes no longer visible?
It is during interphase, telophase, and cytokinesis that the chromosomes are no longer visible.
Which statement best describes cancer cells?
In other words, cancer cells form disorganized multilayer of cells, which can not be regulated. As a consequence, they can even cross the blood vessels to other body organs ( a process that is called metastatis). Thus, option D) is the best statement that describes cancer cells.
What are the two events of mitosis?
These basic events of mitosis include chromosome condensation, formation of the mitotic spindle, and attachment of chromosomes to the spindle microtubules. Sister chromatids then separate from each other and move to opposite poles of the spindle, followed by the formation of daughter nuclei.
What are the two parts of cell division?
There are two types of cell division: mitosis and meiosis. Most of the time when people refer to “cell division,” they mean mitosis, the process of making new body cells.
What will proceed only after all kinetochores are attached to spindle microtubules?
At the spindle poles, centrosomes (not shown) are a major site of microtubule nucleation. … Meanwhile, the SAC ensures anaphase occurs only when all kinetochores have attached to the spindle.
What happens to DNA in each stage of mitosis?
This process involves replication of the cell’s chromosomes, segregation of the copied DNA, and splitting of the parent cell’s cytoplasm. … The outcome of binary fission is two new cells that are identical to the original cell.
What happens when spindle fibers don’t form?
Spindle fiber formation occurs but spindle fibers cannot function properly, i.e. they cannot separate the daughter chromosomes in the division process. … Chromosomes clump in several areas of the cell rather than along the single metaphase plate. Mitosis is disrupted and growth increases.