How many cells in the onion root tip lab were in prophase?

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.

How many cells are in prophase?

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 happens in prophase onion root tip?

Prophase: During this stage, the chromosomes super coil, condense and become visible for first time during the cell cycle. The spindle fibers start forming. The nuclear membrane starts disintegrating. Metaphase: During this stage, the spindle fibers reach and attach to centromere of each sister chromatids.

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How many chromosomes are found in an onion root tip?

Onion root tip cells have 16 chromosomes in each cell.

How do you count cells in an onion root tip?


  1. Turn on the microscope and put an onion root sample slide under the lense.
  2. Adjust the lense until image is in focus.
  3. Count the total number of cells in the view and record the number.
  4. Count the number of cells in interphase and record the number.

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

Telophase. During telophase, the chromosomes at either end of the cell cluster begin to cluster together, which facilitates the formation of a new nuclear membrane. This also is when cytokinesis occurs, leading to two separate cells.

Which stage of mitosis in the cells at the tip of the onion root?

When telophase is complete and the new cell membrane (or wall in the case of the onion root tips) is being formed, the nuclei have almost matured to the pre-mitotic state.

What did you observe in the cells at the tip of the onion root?

As you look at the cells of the root tip, you may notice that some cells seem to be empty inside (there is no dark nucleus or visible chromosomes). This is because these cells are three dimensional, but we are looking at just thin slices of them.

Why are cells in an onion root tip undergoing mitosis?

Why is onion root tip used to demonstrate mitosis in this experiment? It is because of the meristematic cells that are situated in the tip of the roots that render the most desirable and suitable raw material to study the different stages of mitosis.

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How many cells in the onion root tip lab were in anaphase?

Lab Questions

Cell Cycle Stage Number Percentage
Interphase 265 60
Prophase 154 34.5
Metaphase 12 2.5
Anaphase 6 1.5

What is the chromosome number of an onion root cell during each of the following stages?

For example, each human cell possesses 46 chromosomes, while each cell of an onion possesses 8 chromosomes. All cells must replicate their DNA when dividing.

How many hours are cells in prophase?

From the frequency of mitotic phases, defined as indicated in the preceding article (El-Alfy & Leblond, 1987) and corrected for the probability of their occurrence, it was estimated that prophase lasted 4.8 hr; metaphase, 0.2 hr; anaphase, 0.06 hr and telophase, 3.3 hr, while the interphase lasted 5.4 hr.

How many cells in the onion root tip lab were in metaphase?

A whole onion root tip has a total of 100 cells. Of these 100 cells, 58 are in interphase, 17 are in prophase, 11 are in metaphase, 5 are in anaphase, and 9 are in telophase.

How do you calculate the percentage of cells produced during prophase?

Calculate the percentage of time spent in each phase by counting the total number of cells in each phase (total in interphase, in prophase, etc.) and dividing each by the total number of cells you counted.