Lab 3 Mitosis and Meiosis BIO201L
Student Name:
Access Code (located on the lid of your lab kit):
Lab Report Format Expectations
Utilize college level grammar and professional formatting when completing this worksheet.
Submissions without proper formatting, all required photos or sufficient responses will be rejected.
Pre-lab Questions
1. What are chromosomes made of?
Chromosomes are made up of proteins and DNA that are organized into genes. There are
normally 23 pairs of chromosomes in each cell.
2. Compare and contrast mitosis and meiosis, ensuring to detail the differences in both function
and in process. (Hint: Your response should be 4-5 sentences long.)
Mitosis- Happens in 4 stages plus interphase in somatic cells. Produces 2 diploid daughter cells
and the chromosome number stays the same. Meiosis- happens in 8 stages plus interphase in
germ cells. Produces 4 haploid daughter cells and the chromosome is split in half to each
daughter cell. Similarities: both mitosis and meiosis start with a single parent cell.
3. Cancer is a disease related to uncontrolled cell division. Investigate two known causes for these
rapidly dividing cells and use this knowledge to invent a drug that would inhibit the growth of
cancer cells. (Hint: Your response should be 4-5 sentences long.)
Two known causes for rapidly dividing cells are mutations through the environment and genetic
mutations. Cancer can be controlled at early stages with chemical treatments, radiation, and
sometimes even surgery. For example, Radiation therapy helps treat cancer by using high-energy
rays to damage and kill cancer cells. It works by damaging the DNA of cancer cells, which
prevents them from growing and dividing.
,Lab 3 Mitosis and Meiosis BIO201L
EXPERIMENT 1: OBSERVATION OF MITOSIS IN A PLANT CELL
Introduction Questions
1. State how you will calculate the number of hours each stage of mitosis takes based on
observations. Do so by either stating the “Hours of Stage” equation, or by discussing the
equation and its application. If you decide to insert an equation, you must use an equation
editor to properly state the equation with the correct symbols and fraction format.
Observe a large number of cells under a microscope and count how many cells are in each stage
of mitosis (prophase, metaphase, anaphase, and telophase) at a given time. This is often done
using a sample of cells that are actively dividing.
Calculate the proportion of cells in each stage relative to the total number of cells observed. This
gives you the fraction of the cell cycle that each stage occupies.
*Multiply the proportion of cells in each stage by the total duration of the cell cycle to estimate
the time spent in each stage.
if 50 cells out of a total of 200 cells observed are in prophase, and the total cell cycle duration is
24 hours, then:
Proportion of cells in prophase: 50/200 = 0.25 or 25%
*T"Hours of Metaphase = (10/100) * 24 = 2.4 hours", calculates the duration of the metaphase
stage in a cell cycle. metaphase represents 10% of the total cell cycle time, which is typically 24
hours. Therefore, 2.4 hours are spent in metaphase, according to biology resources.Time spent in
prophase: 0.25 * 24 hours = 6 hours
*"Hours of Anaphase" = (5/100) * 24 = 1.2 hours is correct. This represents the proportion of
time spent in the anaphase stage of mitosis, given that it accounts for 5% of the total cell cycle
time, which is typically 24 hours.
2. In Table 1, below, predict how many hours of the 24-hour cell cycle you think each step takes.
Ensure you provide robust supporting evidence to back your prediction.
Table 1: Mitosis Predictions
, Lab 3 Mitosis and Meiosis BIO201L
My predictions are the longest stage of mitosis will be interphase and
the shortest phase will be telophase
The predictions for each stage of mitosis in a 24-hour cell cycle are as
follows:
Predictions
Prophase: 4 hours
Metaphase: 1 hour
Anaphase: 2 hours
Telophase: 1 hour.
Telophase has the least amount of cells whereas, interphase has
the greatest amount of cells present
Supporting Evidence
Student Name:
Access Code (located on the lid of your lab kit):
Lab Report Format Expectations
Utilize college level grammar and professional formatting when completing this worksheet.
Submissions without proper formatting, all required photos or sufficient responses will be rejected.
Pre-lab Questions
1. What are chromosomes made of?
Chromosomes are made up of proteins and DNA that are organized into genes. There are
normally 23 pairs of chromosomes in each cell.
2. Compare and contrast mitosis and meiosis, ensuring to detail the differences in both function
and in process. (Hint: Your response should be 4-5 sentences long.)
Mitosis- Happens in 4 stages plus interphase in somatic cells. Produces 2 diploid daughter cells
and the chromosome number stays the same. Meiosis- happens in 8 stages plus interphase in
germ cells. Produces 4 haploid daughter cells and the chromosome is split in half to each
daughter cell. Similarities: both mitosis and meiosis start with a single parent cell.
3. Cancer is a disease related to uncontrolled cell division. Investigate two known causes for these
rapidly dividing cells and use this knowledge to invent a drug that would inhibit the growth of
cancer cells. (Hint: Your response should be 4-5 sentences long.)
Two known causes for rapidly dividing cells are mutations through the environment and genetic
mutations. Cancer can be controlled at early stages with chemical treatments, radiation, and
sometimes even surgery. For example, Radiation therapy helps treat cancer by using high-energy
rays to damage and kill cancer cells. It works by damaging the DNA of cancer cells, which
prevents them from growing and dividing.
,Lab 3 Mitosis and Meiosis BIO201L
EXPERIMENT 1: OBSERVATION OF MITOSIS IN A PLANT CELL
Introduction Questions
1. State how you will calculate the number of hours each stage of mitosis takes based on
observations. Do so by either stating the “Hours of Stage” equation, or by discussing the
equation and its application. If you decide to insert an equation, you must use an equation
editor to properly state the equation with the correct symbols and fraction format.
Observe a large number of cells under a microscope and count how many cells are in each stage
of mitosis (prophase, metaphase, anaphase, and telophase) at a given time. This is often done
using a sample of cells that are actively dividing.
Calculate the proportion of cells in each stage relative to the total number of cells observed. This
gives you the fraction of the cell cycle that each stage occupies.
*Multiply the proportion of cells in each stage by the total duration of the cell cycle to estimate
the time spent in each stage.
if 50 cells out of a total of 200 cells observed are in prophase, and the total cell cycle duration is
24 hours, then:
Proportion of cells in prophase: 50/200 = 0.25 or 25%
*T"Hours of Metaphase = (10/100) * 24 = 2.4 hours", calculates the duration of the metaphase
stage in a cell cycle. metaphase represents 10% of the total cell cycle time, which is typically 24
hours. Therefore, 2.4 hours are spent in metaphase, according to biology resources.Time spent in
prophase: 0.25 * 24 hours = 6 hours
*"Hours of Anaphase" = (5/100) * 24 = 1.2 hours is correct. This represents the proportion of
time spent in the anaphase stage of mitosis, given that it accounts for 5% of the total cell cycle
time, which is typically 24 hours.
2. In Table 1, below, predict how many hours of the 24-hour cell cycle you think each step takes.
Ensure you provide robust supporting evidence to back your prediction.
Table 1: Mitosis Predictions
, Lab 3 Mitosis and Meiosis BIO201L
My predictions are the longest stage of mitosis will be interphase and
the shortest phase will be telophase
The predictions for each stage of mitosis in a 24-hour cell cycle are as
follows:
Predictions
Prophase: 4 hours
Metaphase: 1 hour
Anaphase: 2 hours
Telophase: 1 hour.
Telophase has the least amount of cells whereas, interphase has
the greatest amount of cells present
Supporting Evidence
