Two to four monomers of Dna AA TP bind at the origin, and after release of DiaA, they recruit two "pre-priming" complexes of the DnaB helicase bound to DnaC-ATP, so that there is one DnaB-DnaC-ATP complex for each of the two (bidirectional) replication forks.

TLS Online TPP Program

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#Unit 5. Developmental Biology

Hans Driesch’s pressure-plate experiment implies that cell interaction is critical for normal development.

TLS Online TPP Program

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#Unit 5. Developmental Biology

Syncytial specification uses elements of both autonomous and conditional specification.

TLS Online TPP Program

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#Unit 5. Developmental Biology

A cytoplasm that contains many nuclei is called a syncytium.

TLS Online TPP Program

#Id: 106

#Unit 5. Developmental Biology

Syncytial specification occurs when cell fates are determined in a syncytium of nuclei, as in the

Drosophila blastoderm

TLS Online TPP Program

#Id: 107

#Unit 5. Developmental Biology

A cell is determined to a given fate if it maintains its developmental maturation toward this cell type even when placed in a new environment (commitment is irreversible).

TLS Online TPP Program

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#Unit 5. Developmental Biology

Determination

The process by which portions of the genome are selected for expression in different embryonic cells.