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DNA & Chromosomes
Objective 3
DNA vs. Chromosomes
• DNA
– DNA is a double helix
– DNA is in the nucleus of our cells
– DNA contains our genes
• Chromosomes
– Chromosomes are shaped like an “X”
– Chromosomes are in the nucleus of our cells
– Chromosomes contain our genes
Review
• What is the shape of DNA?
• What is the shape of chromosomes?
• What do DNA and chromosomes have in
common?
DNA & Chromosomes
• Your DNA is about a meter (3 ft) long
• This has to fit inside everyone of your
cells’ nuclei
• DNA is wrapped tightly around proteins
(histones) in the nucleus forming “X”s
• Chromosomes = DNA + histones tightly
wrapped together
Chromosome Structure
Nucleosome
Chromosome
DNA
double
helix
Centromere
Sister
Chromatids
Coils
Supercoils
Histones
Video
• http://www.copernicusproject.ucr.edu/ssi/H
SBiologyResources.htm
Closure
• Write 2-3 sentences explaining the
relationship between DNA &
Chromosomes.
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