In Chapter 10 we meet Tea Cake Woods, the third man who is a major influence in Janie’s story. We discussed this character and the development of their relationship a….
Mitosis and Meiosis Lab
One of the characteristic features of living organisms is their capacity to grow and reproduce. As the cells grow in size, the limited capacity to expand as the cells increase in size to accommodate the increasing contents necessitates the cell to divide. Cell division plays an important role in –
- single celled prokaryotes, for e.g. amoeba that divided asexually by a simple process of binary fission.
- growth and development of multicellular eukaryotic organisms. Eukaryotic organisms begin their life from a single celled zygote that divides and differentiates to assume the form and function of an adult. (see figure below).
- the continuous growth and renewal of cells in multicellular eukaryotes.
Figure 1: The single celled zygote divides by repeated divisions and eventually develops into an individual.
There are two types of cell division:
- Mitosis– is a type of cell division involved in the development of a single celled zygote into an adult organism, growth and repair of tissues and in asexual reproduction. In mitosis the parent cell divides into two daughter cells that are genetically identical to parent cell, i.e. the chromosome number is same to parent cell. The fidelity of the process ensures the heritable transmission of traits essential for maintaining the continuity of life.
- Meiosis – by which the germ cells divide to form gametes. Each parent cell produces four daughter cells in which the chromosome number is reduced to half. Meiosis involves genetic recombination by the process of crossing over. (opens in a new window)
Please watch the following supplemental videos.
- Cell Cycle, Mitosis and Meiosis from Bozeman Science (opens in a new window)
- Mitosis: Splitting Up is Complicated from Crash Course (opens in a new window)
- Meiosis: Where the Sex Starts from Crash Course (opens in a new window)
Please proceed to the Analysis and Questions Section.
Part I: Mitosis Activity (Virtual)
On the right side of the screen, click on the link to “MITOSIS”. Read the text on this page and view the animation, you can slow down the video by clicking step by step through the phases.
List the stages of mitosis in order and write at least 1 fact per phase. (recommend a table)
|Cellular activity||Stage of Mitosis/Cell Cycle|
|Chromatin condenses into chromosomes|
|Chromosomes align in center of cell.|
|Longest part of cell cycle|
|Cell is cleaved into two new daughter cells|
|Daughter chromosomes arrive at the poles|
Part II – Meiosis Tutorial (Virtual)
You will need to explore the website and view the virtual cell undergoing meiosis at The Biology Project: Meiosis (opens in a new window)
See the Contents: You will browse through each topic.
Part A: Reproduction
- Give an example of asexual reproduction.
- What is a clone?
- Name the two types of gametes produced by meiosis.
To proceed to Part B material in the website, please click the “Next” button
Part B: Chromosomes in a Diploid Cell
- What is the diploid chromosome number for humans?
- Egg and sperm cells are [haploid / diploid]
To proceed to Part C material in the website, please click the “Next” button.
Part C: Meiosis 1 and Meiosis 2
Name the stage of meiosis 1 where each of the following occurs:
|Homologous chromosomes pair and form synapses:|
|Bivalents align at metaphase plate:|
|Two complete daughter cells form:|
|Nuclear membrane disappears:|
|Nuclear membrane reforms:|
View the meiosis 1 and 2 animation
18. At the end of meiosis 2, each cell contains how many chromosomes?
To proceed to Part D material in the website, please click the “Next” button Part D: A Review of Meiosis
19. Name 2 errors that can occur during meiosis.