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WorksheetsMitosis and Meiosis
Total questions: 23
Worksheet time: 4hrs 50mins
G1
S
G2
M
Refer to the diagram shown above. What occurs at G1 ?
Chromatin condenses to form chromosomes
Cleavage of cytoplasm and formation of cell plate
Period of growth and development between mitotic divisions
Nuclear membrane, nucleolus, and chromatin fade
Which statement below correctly identifies what happens prior (before) to the cell being allowed to
enter the G2 stage of the cell cycle?
The cell makes RNA
The nucleus divides
DNA replication occurs
The chromosomes align
What part of the cell cycle results in daughter cells?
Mitosis
Prophase
Cytokinesis
G2 checkpoint
What is the purpose of mitosis?
It guarantees that each daughter cell has half the amount of DNA of parent cells.
It ensures that new nuclei have an exact copy of DNA.
It ensures the reproduction of mitochondria and chloroplasts.
It prevents the occurrence of cancer cells.
What process results in two complete strands of DNA from one original strand?
DNA replication
DNA transcription
DNA translation
DNA transformation
Refer to the diagram above. Arrange the stages in order.
I, II, III, IV, V, VI
VI, II, I, IV, V, III
III, VI, I, IV, II, V
V, III, IV, I, II, VI
Which stage of the cell cycle in the diagram above shows the formation of spindle fibers and chromatin condensing into chromosomes?
I
III
IV
VI
During prophase, chromosomes become visible, the spindle forms, and the nucleolus and nuclear envelope disappear. In which cellular process does prophase occur?
Mitosis
DNA replication
Interphase
Growth Phase
The diagram above shows stages of the cell cycle in random order. What is occurring within the cell labeled II?
A cleavage (splitting) furrow is forming to divide the cell into two daughter cells.
DNA is replicated so there are two copies of each chromosome in each daughter cell.
Chromatin is condensing to form visible chromosomes.
The spindle is attaching to chromatids to move them to the middle.
A student is investigating mitosis by examining detailed pictures of the process. The student wants to observe the formation of the nuclear envelope around the chromosomes.
The student should focus on pictures of which phase of mitosis?
Prophase
Metaphase
Anaphase
Telophase
Which of the following describes what happens at the end of the M phase and before the G1 phase of the cell cycle?
The cell grows in size
The nucleus divides
Cytokinesis occurs
DNA replicates
During the cell cycle, normal cells exit the G1 phase and enter the G0 phase where they rest. Typically, cells will reenter the cycle at G1 prior to going on to S phase. However, abnormal cells, such as cancer cells, may not be allowed to enter the G0 phase to rest.
As a result, these cells will most likely —
mutate during G2 phase
continuously repeat the cycle
die after DNA replication
fail to complete mitosis
Which statement does NOT describe cell cycle checkpoints?
Normal checkpoints assess damage to DNA.
Faulty checkpoints may lead to abnormal cell growth.
Cell checkpoints can fail in mitosis and meiosis.
Defective checkpoints result in the death of the cell.
Cells in a developing embryo respond to substances that stimulate them to go through the cell cycle without entering G0 in order to form many new cells quickly. These substances are produced from the instructions in oncogenes. Oncogenes are turned off as organisms mature.
What results if the oncogenes are reactivated later during growth and development?
Cells self-destruct by undergoing apoptosis.
Cells enter G0 and remain there indefinitely.
Cells divide uncontrollably and form tumors.
Cells make too much DNA while in the S phase.
Leukemia is cancer of the body’s blood-forming tissues. A leukemia patient’s bone marrow produces abnormal white blood cells which do not function properly. A pharmacology company is trying to develop drugs to regulate the production of abnormal white blood cells.
Which of the following processes is most likely affected by this new drug?
Cellular respiration
Transport of molecules
Cell differentiation
Cellular division
Disruptions in which part of the cell cycle may lead to genetic disorders in the offspring of an organism?
Cytokinesis of stem cells in the skeletal system
Meiosis in the formation of haploid cells in a tree
DNA replication of X and Y chromosomes in liver cells
Mitosis of cells that form flower petals
Which of the following statements is true regarding cell cycle disruption during meiosis?
Disruption of meiosis in an egg cell will affect every cell formed after the egg is fertilized.
Cell cycle disruptions occur during interphase and would not affect cells during meiosis.
Disruptions during meiosis will affect cells in a parent, but not in its offspring.
Cell cycle disruptions do not occur in gamete production due to the importance of reproduction in species survival.
Which of the following is not an effect of meiosis?
Causes more genetic diversity in sexually reproductive species
Reduces the number of offspring affected by genetic mutations
Ensures the same number and types of chromosomes in each individual
Improves the chances of species survival due to variability in individual strengths
If it were possible for a gamete to form without undergoing meiosis, how would a zygote formed with this gamete be affected?
The zygote would be genetically identical to the parents.
There would be no noticeable effect on the zygote.
A new species would be formed by the zygote.
The zygote would not be capable of surviving.
Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?
Gametes have a single function which requires less DNA to perform the function compared to somatic cells.
A reduction in the number of chromosomes reduces the chances for mutations that would affect the offspring.
The offspring will have the correct number of chromosomes when the sperm and egg are joined.
The chromosomes in gametes are already replicated strands of DNA which returns the number of chromosomes to the original amount.
The diagram above illustrates a process that occurs often during meiosis. The most likely result of this process is —
mutation in gametes
genetically diverse (different) gametes
new types of cells forming
cancer in the ovaries
Meiosis plays a more significant role in reproduction than mitosis in which of the following ways?
Increasing the variability of genetic information
More efficiently using energy in the cell division process
More rapidly reproducing and growing
Increasing the process of asexual reproduction
