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Copyright © 2011 InteractiveScienceLessons.com

Cut here, front side only 4cm

Copyright © 2011 InteractiveScienceLessons.com Cut here, front side only 4cm

Copyright © 2011 InteractiveScienceLessons.com This is a single chromosome. Every cell in your body contains 46 of them. 23 came from your mom, and 23 are from your dad.

Copyright © 2011 InteractiveScienceLessons.com Cut here 10cm

Copyright © 2011 InteractiveScienceLessons.com When chromosomes from your mom and dad join, the pair resembles an “X”.

Copyright © 2011 InteractiveScienceLessons.com

Upon closer examination, chromosomes are made of a fine thread- like substance called DNA. It’s wound very tightly. When chromosomes from your mom and dad join, the pair resembles an “X”.

Copyright © 2011 InteractiveScienceLessons.com 18cm First, draw a meandering line to the next cut

Copyright © 2011 InteractiveScienceLessons.com 18cm Next, draw lines opposite the first

Copyright © 2011 InteractiveScienceLessons.com Include “rungs”

Copyright © 2011 InteractiveScienceLessons.com DNA resembles a twisted ladder.

Copyright © 2011 InteractiveScienceLessons.com

The “rungs” of DNA are made of bases.

Copyright © 2011 InteractiveScienceLessons.com A A TT T G C C G C G G C A

The “rungs” of DNA are made of bases. There are 4 bases: A, T, G, C. A’s only go with T’s, and G’s only with the C’s.

Copyright © 2011 InteractiveScienceLessons.com A A TT T G C C G C G G C A

The “rungs” of DNA are made of bases. There are 4 bases: A, T, G, C. A’s only go with T’s, and G’s only with the C’s. A gene is a section of base pairs.

Copyright © 2011 InteractiveScienceLessons.com So what is it about that makes you you? DNA

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