4. Flow of genetic information
Textbook pages 389-396 (Concept 17.1)
,Are phenotypes
caused by
genes or the
environment?
How do genes influence phenotype?
How many genes influence a
phenotype?
How does the environment influence
phenotype?
What about individual variation?
What about species variation?
, The Central Dogma of Molecular Biology
• Information content of
DNA is in the form of
nucleotides
• DNA inherited by an
organism produces
specific traits by dictating
the synthesis of proteins
• Proteins are the link
between genotype and
phenotype via gene
expression
• Gene expression = the
process by which DNA
directs protein synthesis
……..a theory stating that genetic information flows only in one direction,
from DNA, to RNA, to protein, or from RNA directly to protein
……most of the time
Textbook pages 389-396 (Concept 17.1)
,Are phenotypes
caused by
genes or the
environment?
How do genes influence phenotype?
How many genes influence a
phenotype?
How does the environment influence
phenotype?
What about individual variation?
What about species variation?
, The Central Dogma of Molecular Biology
• Information content of
DNA is in the form of
nucleotides
• DNA inherited by an
organism produces
specific traits by dictating
the synthesis of proteins
• Proteins are the link
between genotype and
phenotype via gene
expression
• Gene expression = the
process by which DNA
directs protein synthesis
……..a theory stating that genetic information flows only in one direction,
from DNA, to RNA, to protein, or from RNA directly to protein
……most of the time
