Meiosis

On your own and without assistance, complete this Lab 5Answer Sheet electronically and submit it via the Assignments Folder by the date listed intheCourse Schedule(under Syllabus).

 

·         To conduct your laboratory exercises, use the Laboratory Manual located under Course Content. Read the introduction and the directions for each exercise/experiment carefully before completing the exercises/experiments and answering the questions.

 

·         Save your Lab 5Answer Sheet in the following format:  LastName_Lab5 (e.g., Smith_Lab5).

 

·         You should submit your document as a Word (.doc or .docx) or Rich Text Format (.rtf)file for best compatibility.

 

 

 

Pre-Lab Questions

 

  1. Compare and contrast mitosis and meiosis.
  2. What major event occurs during interphase?

 

 

 

Experiment 1: Following Chromosomal DNA Movement through Meiosis

 

Data Tables and Post-Lab Assessment

 

Trial 1 – Meiotic Division Beads Diagram:

 

 

 

Post-Lab Questions

 

  1. What is the ploidy of the DNA at the end of meiosis I? What about at the end of meiosis II?

 

 

 

2. How are meiosis I and meiosis II different?

 

 

 

3. Why do you use non-sister chromatids to demonstrate crossing over? 

 

 

 

 

 

4. What combinations of alleles could result from a crossover between BD and bd chromosomes?

 

 

 

5. How many chromosomes were present when meiosis I started? 

 

 

 

6. How many nuclei are present at the end of meiosis II? How many chromosomes are in each?  

 

 

 

7. Identify two ways that meiosis contributes to genetic recombination.

 

 

 

8. Why is it necessary to reduce the number of chromosomes in gametes, but not in other cells?

 

 

 

9. Blue whales have 44 chromosomes in every cell. Determine how many chromosomes you would expect to find in the following:

 

10. Research and find a disease that is caused by chromosomal mutations. When does the mutation occur? What chromosomes are affected? What are the consequences?

 

11. Diagram what would happen if sexual reproduction took place for four generations using diploid (2n) cells. 

 

 
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