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DNA Replication IAN pg. 97. MAIN IDEAS DNA Helicase DNA Polymerease Base Pairing Chromatids Centromere. Objective: Identify and Define the parts of DNA using notes, lecture, collaboration and origami . A. DNA Helicase enzyme untwists and unzips DNA exposing base pairs.

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slide1

DNA Replication

IAN pg. 97

MAIN IDEAS

  • DNA Helicase
  • DNA Polymerease
  • Base Pairing
  • Chromatids
  • Centromere

Objective:Identify and Define the parts of DNA using notes, lecture, collaboration and origami.

slide2

A. DNA Helicase enzyme untwists and unzips DNA exposingbase pairs

I. DNA Replication before Cell Division (S-Phase)

slide3

B. DNA polymerase enzyme attaches new nucleotide bases to create 2 identical copies of DNA.

1. Nucleotides pairing A – TC - G

slide4

BASE PAIRING RULE

TOP ½ IAN Page 96

dna polymerase
DNA Polymerase

C. Following replication 2 genetically identical copies condense into chromosomes

slide6

D. Chromosomes have 2 parts

1. Chromatidsarms of the chromosome, genetically identical from DNA replication

2. Centromerecenterprotein structure holds chromatids together.

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Chromosome

Bottom ½ IAN page 96

Centromere

Chromatid

Chromatid

Genetically Identical arms

Chromatid

Chromatid

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II. DNA remains constant in all cells except in erythrocytes (Red Blood Cells) and sex cells

III. Different Organisms have different amounts of DNA

A. Homo sapiens (Humans) = 46 Chromosomes

B. Myrmecia pilosula (Ant) = 2 Chromosomes

C. Ophioglossom reticulatum (Fern) = 630 Chromosomes