Genetic Code

Page
1

Slide 1

Genetic code

Lesson 1: The structure of DNA

Objectives: I can describe the structure of DNA, I can explain the difference between an allele, a gene and homologous chromosomes

Slide 2

Genes

Genes are sections of DNA that contain coded information that determines the nature and development of organisms

Slide 3

Allele

A different form of a particular gene, positioned in the same relative position (locus) on homologous chromosomes

Homologous chromosomes

Gene locus – position on the chromosome

Alleles (diff versions of the genes)

Slide 4

Homologous chromosomes

Two chromosomes which contain the same genes but may contain different alleles

Slide 5

DNA nucleotides

Phosphate group

Pentose sugar

Nitrogenous base

Slide 6

Phosphodiester bond

Slide 7

Sugar phosphate

backbone

Nucleotide

Polynucleotide

chain

Slide 8

4 different bases

Slide 9

Slide 10

Double helix

5’end

5’end

3’end

3’end