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Transcript
Introduction to DNA Question: • From your on-line computer activity, what do you know about the structure of DNA? Structure of DNA • DNA is a polymer of what???? Nuclotides! There are two types of bases: Adenine & Guanine (A&G)= Thymine & Cytosine ( T & C) = There are two types of bases: Intro to DNA • Chromosomes exist in “matching pairs” in the nucleus of a cell • Scientists call the matching pairs “homologous pairs”. • In every human body cell, there are 23 homologous pairs of chromosomes. Example of a human Karyotype IN HUMANS Pair # 1- 22 = “autosomes” Pair #23 = “Sex chromosomes” * XX = * XY = Karyotype • What does the prefix “homo” mean? • How are homologs similar? #1 #2 #3 #4 Karyotype Q: How are homologs different???? • GENE – A: IMPORTANT !! • All 46 chromosomes are present in every human body cell!!! Therefore • All 30,000 genes pairs which make up a human are in every human body cell! IMPORTANT !! • Genome – • *** Every body cell of an organism contains its entire genome !!!! *****
