CREATED BY MUHAMMAD IQBAL KHAN SS Biologymikhan1313@yahoo.com

STORES AND PASSES ON GENETIC INFORMATION FROM ONE GENERATION TO ANOTHER .

DNA DEOXYRIBONUCLEIC ACID

DNA STRUCTURE

THE DNA STRUCTURE IS SHAPED LIKED A SPIRAL STAIRCASE, OR TWISTED LADDER.

DNA STRUCTURE

THE OUTER PARTS OF THE OF THE LADDER ARE MADE OF SUGARS.

DNA STRUCTURE

THE STEPS OF THE LADDER ARE MADE OF PAIRS OF NITROGEN BASES.

DNA STRUCTURE

1. ADENINE = A2. GUANINE = G3. CYTOSINE = C4. THYMINE = T

THEY ARE REPRESENTED BYTHEIR CAPITAL LETTER.

DNA STRUCTURE

THERE IS ONLY ONE WAY THE NITROGEN BASES CAN FORM

ADENINE PAIRS WITH THYMINEGUANINE PAIRS WITH CYTOSINE

DNA STRUCTUREQUESTION ?

CAN C JOIN WITH A

AND G JOIN WITH T

YES

NO

CORRECT

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DNA STRUCTURE

ACTCATGGTCATG

TGAGTACCAGTAC

THIS IS AN EXAMPLE OF A GENETIC CODE THAT MAY BE FOUND IN YOUR BODY.

DNA STRUCTURE

THE COMBINATIONS OF THE NITROGEN BASES IS THE CODE THAT PRODUCES THE GENES FOR A PARTICULAR TRAIT.

DNA STRUCTURE

BECAUSE THERE CAN BE SO MANY DIFFERENT COMBINATIONIS OF THE BASES THE CODE CAN BE LIMITLESS

DNA STRUCTURE

EXAMPLE:

ATCGTCAGG MAY BE FOR HAIR COLOR.

BUT

ATCGTCAGC MAY BE FOR EYE COLOR

DNA REPLICATION

REPLICATION: IS THE PROCESS WHERE DNA MOLECULES FORM EXACT DUPLICATS.

DNA REPLICATION

1. THE LADDER SPLITS

2. FREE FLOATING NITROGEN BASES BEGIN TO PAIR WITH EACH STRAND3. TWO NEW DNA CHAINS ARE FORMED