The dorsoventral patterning of the early Drosophila embryo is controlled by a regulatory protein called Dorsal.

TLS Online TPP Program

#Id: 2951

#Unit 3. Fundamental Processes

An ARS extends for -so bp and includes a consensus sequence (A} and additional elements (B1-B3).

TLS Online TPP Program

#Id: 2952

#Unit 3. Fundamental Processes

Mutations in three adjacent elements, numbered B 1 to B3, reduce origin function.

TLS Online TPP Program

#Id: 2953

#Unit 3. Fundamental Processes

By counting the number of sites to which ORC binds, we can estimate that there are about 400 origins of replication in the yeast genome.

TLS Online TPP Program

#Id: 2954

#Unit 3. Fundamental Processes

By counting the number of sites to which ORC binds, we can estimate that there are about 400 origins of replication in the yeast genome. This means that the average length of a replicon is -35,000 bp.

TLS Online TPP Program

#Id: 2955

#Unit 3. Fundamental Processes

ORC was first found in S. cerevisiae (where it may be called scORC),but similar complexes have now been characterized in Schizosaccharomyces pombe (spORC), Drosophila (DmORC ), and Xenopus (XIORC).

TLS Online TPP Program

#Id: 2956

#Unit 3. Fundamental Processes

ORC is an initiation complex whose binding identifies an origin of replication.