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GENES AND CHROMOSOMES (CHROMOSOME (Basic features: (Centromere,…
GENES AND CHROMOSOMES
CHROMOSOME
Function:
Encodes genetic information
Selonoid fibres coiled
X shape after division only
Basic features:
Centromere
Replication origin
Telomere
GENE FEATURES
Function:
COMPACTING
2 metres of DNA
CHROMATIN
Comp:
DNA
Protein
Function:
Prevent damage
Control Gene Expression
Fit into chromatin
NUCLEOSOME
Beads on a string
Separated by "linker DNA"
Attached onto string with H1 histone proteins
146bp of DNA
Wrapped around core
Octomer of histone proteins
Ring/rosette structure
Stacked rings
Many rings = Selonoid fibre
30nm