Discovering DNA.

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Presentation transcript:

Discovering DNA

Let’s take a closer look at DNA… D = deoxyribo N = nucleic A = acid DNA structure is the double helix It looks like a twisted ladder!

Nucleotides Are made up of… - sugar - phosphate - nitrogenous base The “sides” of the ladder are sugar and phosphate molecules The “rungs” of the ladder are made up of complementary nitrogenous bases

There are FOUR different bases: Adenine (A) Guanine (G) Cytosine (C) Thymine (T) The bases ALWAYS pair together like this: Adenine ---- Thymine Cytosine ---- Guanine

A few more definitions… Gene: Section of DNA that “codes” for a specific protein (instructions for making it) Genome: All an organism’s genes The human genome contains over 20,000 different genes!

Activity #1 Cut out the shapes I have provided for your group “D” – deoxyribose (sugar) “P” = phosphate A, G, T, C are the nitrogenous bases Glue your shapes together to create FOUR nucleotides Glue the nucleotides to your group’s sheet by lining up the complementary bases Circle one nucleotide Label… sugar phosphate name each of the four nitrogenous bases

Activity #2 We’ll watch the video together on DNA, Chromosomes, Genes and Traits If you need to review the video at home, I will post a link to it on our class Blog! Complete the Video Recap sheet for next class