Thus, although the aNTD is embedded in the body of the enzyme, the aCTD can reach the upstream element and can do so even when that element is not located immediately adjacent to the –35 region, but further upstream.

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#Id: 104

#Unit 5. Developmental Biology

Syncytial specification uses elements of both autonomous and conditional specification.

TLS Online TPP Program

#Id: 105

#Unit 5. Developmental Biology

A cytoplasm that contains many nuclei is called a syncytium.

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#Id: 106

#Unit 5. Developmental Biology

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

Drosophila blastoderm

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#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).

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#Id: 108

#Unit 5. Developmental Biology

Determination

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

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#Id: 109

#Unit 5. Developmental Biology

Cells can progress from totipotent to pluripotent to determined.