Question

the following image is a microscopic photograph of a thin slice of onion root. the cells within an onion root are constantly dividing as it grows. each onion cell has been stained dark blue so that the genetic material (chromosomes) is visible.

1. count all the cells in the image provided. do your best, as some are a little blurry. total number of cells= 62
2. determine which cells are in each of the following phases of mitosis. count the number of cells in each phase.
3. by dividing the number of cells in each phase by the total number of cells, determine the percentage of time the cells spend in each phase. (ex: 12 cells in metaphase/120 total cells = 10% of the cell cycle spent in metaphase)

station 4:

1. copy that dna sequence into the correct space below.

a. create an mrna sequence for that dna sequence and write it in the correct space.

1. use the codon chart provided to determine the amino acid sequence that corresponds to your mrna sequence.

#1
dna- back of the sheet
mrna- transcribed from dna sequence
amino acids- sequence using a codon chart
#s 2,3 on the back of this sheet

Explanation:

Step1: Identify total cells

The total number of cells is given as 62.

Step2: Calculate percentage for Inter - phase

The number of cells in inter - phase is 44. The percentage of time spent in inter - phase is calculated as $\frac{44}{62}\times100\approx71.0\%$.

Step3: Calculate percentage for Prophase

The number of cells in prophase is 8. The percentage of time spent in prophase is $\frac{8}{62}\times100\approx12.9\%$.

Step4: Calculate percentage for Metaphase

The number of cells in metaphase is 3. The percentage of time spent in metaphase is $\frac{3}{62}\times100\approx4.84\%$.

Step5: Calculate percentage for Anaphase

The number of cells in anaphase is 4. The percentage of time spent in anaphase is $\frac{4}{62}\times100\approx6.45\%$.

Step6: Calculate percentage for Telophase

The number of cells in telophase is 3. The percentage of time spent in telophase is $\frac{3}{62}\times100\approx4.84\%$.

Answer:

Phase of Cell Cycle	# of cells in this phase	% of time spent in this phase
Prophase	8	12.9
Metaphase	3	4.84
Anaphase	4	6.45
Telophase	3	4.84