This lab was updated on June 1st 2015 this document is downloadable immediately after purchase and contains all of the answers to the whole lab.
Lab 5: Meiosis
- What major event occurs during interphase?
- A person, residing in a location where they are exposed to the sun often, develops a mutation in some of their skin cells resulting in cancer. Consider whether their offspring will be born with the same mutation. Use scientific evidence to support your answer.
Experiment 1: Following Chromosomal DNA Movement through Meiosis
Data Tables and Post-Lab Assessment
Part 1 – Meiotic Division Beads Diagram without Crossing Over
Part 2: Meiotic Division Beads Diagram with Crossing Over
- What is the ploidy of the DNA at the end of meiosis I? What about at the end of meiosis II?
- How are meiosis I and meiosis II different?
- Why do you use non-sister chromatids to demonstrate crossing over?
- What combinations of alleles could result from a crossover between BD and bd chromosomes?
- How many chromosomes were present when meiosis I started?
- How many nuclei are present at the end of meiosis II? How many chromosomes are in each?
- Identify two ways that meiosis contributes to genetic recombination.
- Why is it necessary to reduce the number of chromosomes in gametes, but not in other cells?
- Blue whales have 44 chromosomes in every cell. Determine how many chromosomes you would expect to find in the following:
Daughter Cell from Meiosis I:
Daughter Cell from Meiosis II:
- Research and find a disease that is caused by chromosomal mutations. When does the mutation occur? What chromosomes are affected? What are the consequences?
- Diagram what would happen if sexual reproduction took place for four generations using diploid (2n) cells.
Experiment 2: The Importance of Cell Cycle Control
- Record your hypothesis from Step 1 in the Procedure section here.
- What do your results indicate about cell cycle control?
- Suppose a person developed a mutation in a somatic cell which diminishes the performance of the body’s natural cell cycle control proteins. This mutation resulted in cancer, but was effectively treated with a cocktail of cancer-fighting techniques. Is it possible for this person’s future children to inherit this cancer-causing mutation? Be specific when you explain why or why not.
- Why do cells which lack cell cycle control exhibit karyotypes which look physically different than cells with normal cell cycle.
- What are HeLa cells? Why are HeLa cells appropriate for this experiment?