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A VERY basic tutorial

Mohammad Hissourou III

on 21 July 2013

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Transcript of Mitosis

Mitosis: how we get two cells from one cell
Cell cycle
Broken up into two main phases: Interphase and Mitosis
Interphase is where the cell grows and doubles its DNA.
Mitosis is where the cell divides to form two identical daughter cells.
Mitosis has four phases; prophase, metaphase, anaphase and telophase
chromatin condenses to form chromosomes*
each chromosome is now a sister chromatid.

Cell replication in eukaryotes*
Eukaryotes have nuclei. Prokaryotes do not.
Karyote=nut or nucleus
Eukaryote- truly has a nucleus
Prokaryote-Before nucleus existed
Key terms and Information
Overview of Mitosis

Sister chromatids align in center of cell
Remember! One chromosome is now made of two chromatids! (sister chromatids)

Chomosomes (sister chromatids) split and are pulled by centrosomes to opposite ends of the cell

End goal:two identical daughter cells
Review Questions
1. At the beginning of Mitosis, how many chromosomes are there? How many sister chromatids?

2. A scientist wants to highlight the new DNA made during the cell cycle. She puts in radioactively labeled DNA into the cell during metaphase. Will her experiment succeed? Why or why not?

Chromatin: Loose genetic information made of DNA and proteins

Chromosome: condensed genetic information made from chromatin

Chromatid: After genetic replication, each chromosome is made up of twice the original DNA. One half of a duplicated chromosome is called a chromatid. Together, they are called sister chromatin

Cells have 46 chromsomes; 23 chromosomes from each parent

1. Why do we even care? With so many cells in our body, why would we ever need more cells?
Questions to start with
2. Why should make new cells from old cells? Why don't we just make new cells from scratch?
Full transcript