epigenetics

Question 1

define epigenetics

how does it control G.E?

Answer 1

changes to gene expression due to environmental factors

- prevents transcription

Question 2

more methlyation

Answer 2

terminates transcription

- methyl groups bind to DNA at CpG sites so transcription enzymes e.g RNA polymerase cannot attach

Question 3

less acetylation

Answer 3

terminates transcription
- less acetyl groups mean histones are more tightly coiled so transcription enzymes cannot bind so gene cannot be expressed as transcription is prevented