Flashcards in Chapter 10 -2 Deck (12):
200 different cell types each only express ?% of genes at a given time.
What are the 2 parts of Control Transcription?
DNA packaging & DNA Methylation
What happens in DNA packaging?
Chromatin is tightly wound & bound to histone proteins
What does DNA packaging limit?
access for transcription
What controls access in DNA packaging?
What happens in DNA methylation?
methyl groups turn off some parental genes
What does DNA methylation contribute to?
What encourages X chromosome inactivation in each cell in female mammals?
What do regulatory genes do?
enhance binding sites and interact with activators or repressors
What are regulatory genes?
non coding DNA control elements: upstream and downstream of a gene.
What do master regulatory genes do?
controls activity of other genes and determines pattern formation