Biology Lab Shahimermaid

UMUC Biology 102/103

Lab 5: Meiosis

INSTRUCTIONS:

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

· To conduct your laboratory exercises, use the Laboratory Manual that is available in the WebTycho classroom (Reserved Reading or provided by your instructor) or at the eScience Labs Student Portal. Laboratory exercises on your CD may not be updated.

· Save your Lab5AnswerForm in the following format: LastName_Lab5 (e.g., Smith_Lab5).

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

Experiment 1: Following chromosomal DNA movement

Procedure

Meiosis I

Prophase I—

Metaphase I—

Anaphase I—

Telophase I—

Meiosis II

Prophase II—

Metaphase II—

Anaphase II—

Telophase II—

Questions

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

2. Why are chromosomes important?

3. How are Meiosis I and Meiosis II different?

4. Name two ways meiosis contributes to genetic recombination.

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

6. How many chromosomes were present when Meiosis I started?

7. Why is it necessary to reduce the chromosome number of gametes, but not other cells of an organism?

8. If humans have 46 chromosomes in each of their body cells, determine how many chromosomes you would expect to find in the following:

Sperm _________________

Egg _________________

Daughter cell from mitosis _______________

Daughter cell from Meiosis II _________________

9. Investigate a disease that is caused by chromosomal mutations. When does the mutation occur? What chromosome is affected? What are the consequences?

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