Gene Regulation in prokaryotes and epigenetics Flashcards
Explain how environmental factors can affect regulation over long periods of time
Define epigenetics
Access to genes which doesn’t change the DNA of sequences.
Look at lecture slides about review on lac operons
What is pre transcription
Histones and the way proteins organize into DNA
What are some ways organisms could change the way their genes are expressed without changing the sequence of DNA
The chemical factors or environmental
What can be reviser able and one negative factor too?
Epigenetics but could last 2 generations when reversed.
What changes does it affect
The packages of DNA
Name two ways packaging of DNA can be changed
DNA methylation and histone acetylation
What is DNA methylation
The adding or removing of methyl groups.
Where are methyl groups added
CpG islands
Maintenace methylation
Adds methyl groups to new strands.
What is Histone Acetylation
Adding acetyl groups to the tails of histones
How do you think acetyl groups impact how tightly coiled a DNA molecule is?
How is Histone the same as Methlylation different
Changing the promoter region and the coordination with DNA wrapping
What is Barr bodies,
form from widespread DNA methylation and Histone with changes to packaging all but one chromosome
