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UNDERSTANDING DNA MOLECULE OF HEREDITY

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UNDERSTANDING DNA MOLECULE OF HEREDITY Powered By Docstoc
					 UNDERSTANDING DNA
MOLECULE OF HEREDITY




            Biology
           11th Grade
       By Patricia Mbugua
         OBJECTIVES
Students will identify the DNA
molecule and understand its function
as a molecule of heredity
Students will be able to identify and
name the function of the DNA bases,
sugar, and phosphate
Structure of DNA


 The letters DNA stand for
 DeoxyriboNucleic Acid
  The basic unit used to make a
 strand of DNA is called a nucleotide
 A single nucleotide consists of a
 sugar molecule, a phosphate group,
 and a base
Video on the Function of the DNA
Click on this website to view a video
on the DNA as a molecule of heredity

    http://genetics.gsk.com/flash_dna_actual.htm
       STRUCTURE OF THE
          NUCLEOTIDE
The nucleotide is held together by a
backbone made of sugars and
phosphate group
The backbone carries four types of
molecules called bases
It is the sequence of these four
bases that encodes information
The main job of the DNA is to
encode the sequence of amino acids
residues
    BASES


 The DNA’s strands twist forming a
 double helix shape
 The DNA double helix is stabilized by
 hydrogen bonds between the bases
 attached to two strands
 The four bases found in DNA are
Adenine-A, Cytosine – C, Guanine-G,
 Thymine-T
          BASE PAIRING
Each type of the base on one
strand forms a bond with just one
type of base on the other strand
This is called complementary base
pairing
Adenine bonds only with Thymine
A-T
Cytosine bonds only with guanine
C-G
      How the code works
A stretch of DNA could be
AATGACCAT-
This would code for a
different gene than a stretch
that reads GGGCCATAG
This four bases have endless
combinations just like the
letters of the alphabet can
combine to make different
words
      What did we learn?
            QUIZ
Click on the DNA molecule




                            B
      A
           RIGHT
WELLDONE




                   NEXT
   Click the base that pairs with
              Adenine
Guanine
                    Thymine
        You missed it
OOPS WRONG ANSWER




 BACK
           Excellent
Good Job
Remember to continue
working
On the DNA molecule!
                        Credit
References:
http://genetics.gsk.com/flash_dna_actual.htm
http://www.biologycorner.com/worksheets/DNAcoloring.html
http://school.discovery.com/quizzes6/muskopf/dna.html
            WRONG
TRY AGAIN




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posted:11/29/2011
language:English
pages:15