March 30, 2015 Period 2
• Cell Reproduction Unit 2 Quiz – Mitosis Study Guide
will be updated and available online by this evening.
• Cell Reproduction Unit 2 Quiz – Mitosis is scheduled for
Thursday, 4/2/15, but it will be on the fourth marking
period.
• Yes, you will be able to see your Quiz 1 from Friday, but
I will be collecting it back until Wednesday.
Happy Monday!
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Two sets of DNA
Mitosis
Chromatin
Chromosomes
Segregation is occurring
Creating Proteins and structures necessary for segregation
and cytokinesis.
If these were the answers, what
were the questions?
Two sets of DNA
How many sets of DNA are needed for cell division to
occur?
What genetic material is present after the S Phase of the
cell cycle?
Mitosis
Which phase within the cell cycle includes the
distribution of the chromosomes (the genetic material)?
Chromatin
What is a complex of DNA and proteins called?
Possible Questions
Chromosomes
What is the genetic material within a cell called?
How do we refer to DNA when it is occurring in pairs?
Segregation is occurring
 What is happening during the first phase of cell division?
Creating proteins and structures necessary for segregation and
cytokinesis
What is happening during the GAP 2 phase of the cell cycle?
Possible Questions
• During S phase?
• What does DNA look like?
• How does the cell ensure that the two copies of each
chromosome stay together?
• Distinguish between chromatin, chromosome,
chromatids. Which ones are visible under the
microscope?
What Happens Before
Mitosis?
• During S phase?
The DNA is being replicated so that at the end of the S Phase there are two complete sets of
DNA
• What does DNA look like?
DNA is long, thin, thread-like DNA and contains associated proteins.
• How does the cell ensure that the two copies of each chromosome stay together?
During prophase of Mitosis the chromatin super coils and wraps around proteins called histones
and becomes chromosomes. A protein disk called a centromere attaches the DNA and its exact
copy together forming chromosome.
• Distinguish between chromatin, chromosome, chromatids. Which ones are visible under the
microscope?
Chromatin is long, thin, thread-like DNA that is invisible under a light microscope.
Chromosome is super coiled DNA wrapped around histones. When the DNA and its exact copy
are super-coiled, the centromere attaches them together. Each half of the chromosome is now
called a chromatid. Chromosomes and chromatids are both visible under light microscope.
What happens before
Mitosis?