Mitosis and Meiosis Lab Bench Virtual Lab PDF

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Lab Bench Virtual Lab: Mitosis and Meiosis In this lab your will go to the following URL, work through the steps of the 2 labs, and take 2 lab quizzes. **Please note that the “check your answers” for the analysis section of lab 1 does not work, but it is still a good exercise to complete. http://www.phschool.com/science/biology_place/labbench/lab3/intro.html Please answer the following questions based on the lab: MITOSIS 

Briefly describe interphase and each of the following stages of mitosis. 1. Interphase: The nucleolus and the nuclear envelope are distinct and the chromosomes are in the form of threadlike chromatin.

2. Prophase: The chromosomes appear condensed, and the nuclear envelope is not apparent.

3. Metaphase: Thick, coiled chromosomes, each with two chromatids, are lined up on the metaphase plate.

4. Anaphase: The chromatids of each chromosomes have separated and are moving toward the poles.

5. Telophase: The chromosomes are at the poles, and are becoming more diffuse. The nuclear envelope is reforming. The cytoplasm may be dividing.

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Complete the table:

Image

Phase of Mitos is

1. ____Prophase____ _____

2. ________Telophase _____

3. ____Metaphase____ _____

4. _____Anaphase___ _____

MEIOSIS 

Study this small section of a slide of Sordaria to determine if crossing over has occurred in the asci designated by an X.

1. In the photo, how many asci marked with an X show no evidence of crossing over? 4 2. In the photo, how many asci marked with an X show evidence of crossing over? 7 3. What is the percent of crossovers? (number of asci with crossovers divided by total number of asci multiplied by 100) 63.6%

4. What can this information be used to calculate? you will be able to calculate the map distance between the gene for spore color and the centromere

Post-Lab Questions 1.In what cellular processes is mitosis involved? In what cellular processes is meiosis involved?

Mitosis:

development, growth, repair, asexual reproduction. Meiosis: formation of gametes or spores

2. In what type of cells does mitosis occur? In what type of cells does meiosis occur? Mitosis: somatic. Meiosis: sex cells or ovaries/testes. 3. How many times does DNA replicate in mitosis? How many times does DNA replicate in meiosis? Mitosis: one. Meiosis: one

4. How many cellular divisions occur in mitosis? How many cellular divisions occur in meiosis? Mitosis:

5.

6.

7.

8.

9.

one. Meiosis: two. How many daughter cells are formed by mitosis? How many daughter cells are formed by meiosis? Mitosis: two. Meiosis: four. What is the chromosome number in daughter cells formed by mitosis from diploid parent cells? What is the chromosome number in daughter cells formed by meiosis from diploid parent cells? Mitosis: 2n (diploid). Meiosis: n (haploid). In mitosis, are daughter cells identical to or different from parent cells? In meiosis, are daughter cells identical or different from parent cells? Mitosis: identical. Meiosis: different. In mitosis, when do synapsis and crossing over occur? In meiosis, when do synapsis and crossing over occur? Mitosis: never. Meiosis: prophase I. In mitosis, when do synapsis and crossing over occur? In meiosis, when do synapsis and crossing over occur?

Use the following figure to answer questions 10 and 11.

10. For an organism with a diploid number of 6, how are the chromosomes arranged during metaphase I of meiosis? C

11. Which sketch shows the arrangement of chromosomes that you would expect to see in metaphase of mitosis for a cell with a diploid chromosome number of 6?D...