Chapter 8: Cell Reproduction

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Chapter 8 Cell Reproduction Genetics

• 8.1 Chromosomes
• Do Now Please answer the following questions on
  your handout
• 1. What part of a eukaryotic cell are
  chromosomes found in? Hint theyre made of
  DNA.
• 2. How are genes related to chromosomes?

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• Unit 6 Cell Reproduction Classical Genetics

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• Unit 7 DNA Molecular Genetics

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• Unit 8 Ecology

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• Unit 9 Evolution

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• Unit 10 Body Systems

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Chromosomes
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Chromosome Structure
DNA strand
Gets wrapped around many
histone proteins (aka histones)
forming a
coil.
Coils are coiled up even more to form a
supercoil,
which is then packaged even more to make a
chromosome.
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Whats the big idea?

• Most of the time, DNA is uncoiled, so that it can
  perform its function of providing instructions to
  the cell.
• Only during cell reproduction does DNA get
  tightly packed into chromosomes

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Parts of a chromosome
The 2 chromatids that make up a chromosome are
called sister chromatids, which
are extremely similar to each other.
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Constructing Model Chromosomes

• Your group has been given enough materials to
  make 4 model chromosomes. There should be 3
  parts to each model chromosome

2 sister chromatids
1 centromere
How many chromosome models could be built using
the parts shown here?
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Evaluating Your Model
Some Questions

• What do our models represent well?
• What characteristics dont they represent so well?

Draw a sketch of your model into your notes,
and Bring them to class tomorrow well be using
them again!
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Tonights Homework

• Read pp. 145-146
• Questions 2-3 p. 147