Useful Tips

What happens to an onion cell during prophase?

What happens to an onion cell during prophase?

During Prophase the nuclear envelope starts to break down and all the chromosomes start to coil up in the center of the cell. 3) Metaphase is the middle stage at which point all the chromosome pairs line up in the center of the cell along spindle fibers that pull to either side of the cell. 4) Anaphase.

What happens between prophase and prometaphase?

In prophase, the nucleolus disappears and chromosomes condense and become visible. In prometaphase, kinetochores appear at the centromeres and mitotic spindle microtubules attach to kinetochores. In telophase, chromosomes arrive at opposite poles, and nuclear envelope material surrounds each set of chromosomes.

Which stage of mitosis is represented in the onion root?

The photomicrograph below depicts onion root tip cell chromosomes in metaphase, ready for separation. The kinetochore and polar microtubules are clearly visible and radiate out the ends of the cell leaving the chromosomes in the middle of the complex.

What happens in the prometaphase stage of mitosis?

Prometaphase is the second 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 prometaphase, the physical barrier that encloses the nucleus, called the nuclear envelope, breaks down.

How many cells are in prophase in an onion root tip?

Let’s count the number of cells in some onion root tips during each phase, and use this information to answer the question. On this slide, there are 21 cells in interphase, 4 in prophase, 2 in metaphase, and 1 in telophase.

What is the other name for meiotic cell division?

What is another word for meiosis?

cell division amitosis
cellular division cytokinesis

Which part of the cell cycle takes the longest?

During interphase, the cell undergoes normal growth processes while also preparing for cell division. It is the longest phase of the cell cycle, cell spends approximately 90% of its time in this phase.

What happens during interphase in an onion root tip cell?

Diagrammatic representation of an onion root tip cell during interphase: Diagrammatic representation of an onion root tip cell during interphase. Credit: During interphase, also known as the resting stage, the chromatin is not tightly packed. This allows for DNA to be copied (replication) as the cell prepares for cell division.

How can you tell the stages of mitosis in an onion?

Under high magnification (100X-500X), it becomes possible to identify cells at different stages of mitosis. While this is not necessarily one of the main stages of mitosis, cells in this state can easily be identified by their prominent nucleoli. Diagrammatic representation of an onion root tip cell during interphase:

What happens to the nuclear envelope during prometaphase?

The major event marking a cell’s entry to prometaphase is the breakdown of the nuclear envelope into small vesicles. Kinetochores also become fully matured on the centromeres of the chromosomes.

Where do chromosomes go during prophase in a cell?

During prophase, the chromosomes supercoil and the fibers of the spindle apparatus begin to form between centrosomes located at the pole of the cells. The nuclear membrane also disintegrates at this time, freeing the chromosomes into the surrounding cytoplasm.