Introduction to DNA. Question: From your on-line computer activity, what do you know about the structure of DNA?

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Presentation 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 # = “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 !!!! *****