Transcript Intro to DNA

Introduction to DNA
Intro to DNA
• NOTE:
• “matching pairs” of
chromosomes
• = “homologous pairs”.
• In every human
somatic 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 somatic cell!!!
 Therefore
• All 30,000 genes
pairs which make up
a human are in every
human body cell!
IMPORTANT !!
• Genome –
• *** Every body (somatic) cell of an
organism contains its entire genome
!!!! *****
DNA Replication
• Can you describe the general process?