1
Name:_____________________
Mitosis and Meiosis
Lab-bench activities
Go to: http://www.phschool.com/science/biology_place/labbench/lab3/intro.html
Click on Introduction
1- What organisms are used to study Mitosis?
2- What organism is used for the study of Meiosis?
3- What is the difference between Haploid and diploid?
4Mitosis
Meiosis
# of cell divisions
# of daughter cells
# of Chromosomes
5-What is the cell cycle? Is it present in both cell divisions?
6-What is the longest phase of the cell cycle? What does the cell do during this phase?
7- What are Homologous chromosomes? Explain Sister Chromatids? You may Sketch the Homologous
chromosomes and label the sister Chromatids
2
7- Name the phases of Mitosis
8- What is Cytokinesis?
9- Can you recognize the phases in real tissue?
10- Explain alleles.
11Stage of Mitosis
# of cells in this phase
12- Take the quiz and put your answers below
Duration of the stage=%of cells
in the stage/1440 min.
3
Meiosis
12-How is Prophase I in Meiosis different from Prophase in Mitosis?
13-Name 3 differences you see when comparing Mitosis to Meiosis
14-Explain Synapsis and Crossing over. Sketch a diagram to represent both. Use colored pencils to show
this event.
15-What is the genetic significance of crossing over?
16-What is Sordaria? How does fertilization occur in Sordaria?
17-What is an ascus?
18- What happens after fertilization?
4
19-What would constitute a crossing over in an ascus?
20-Sketch one ascospore without crossing over, and another one with crossing over.
21-Count crossing overs in Experiment II. Were you accurate in your counting?
22-What does the frequency of crossing over allow scientists to do?
23- What is a map unit? How do you go about calculating the map distance between the color gene of
the spores and the centromere in Sordaria?
24- Calculate the map distance using the formula given in this exercise. Show your work.
25- Why do you divide the percentage of crossing over by 2?
26-Compare Mitosis to Meiosis and check your answers. What is the one fact you learned in your
answering the questions?
27- Take the self- quiz and write your answers below.