Sign stimulus (releaser)

The essential feature of a stimulus, which is necessary to elicit a response.

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#Id: 3879

#Unit 5. Developmental Biology

The emerging column of cells topples over called ‘the slug’.

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#Id: 3880

#Unit 5. Developmental Biology

Slug migrates to the top layer of the soil, where it proceeds to build the fruiting structure.

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#Id: 4734

#Unit 5. Developmental Biology

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#Id: 4735

#Unit 5. Developmental Biology

In C. elegans

When sperm fuses with the egg cell membrane, polyspermy is prevented by the rapid synthesis of chitin by the newly fertilized egg.

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#Id: 4736

#Unit 5. Developmental Biology

The zygote of C. elegans exhibits rotational holoblastic cleavage.

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#Id: 4737

#Unit 5. Developmental Biology

During early cleavage, each asymmetrical division produces:

• One founder cell (denoted AB, E, MS, C, and D) that produces differentiated descendants
• One stem cell (the P1–P4 lineage)