First zygotic genes is Gap genes. Mutations in them cause gaps in the segmentation pattern.

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#Id: 4779

#Unit 5. Developmental Biology

In pop-1-deficient embryos, both EMS daughter cells become E cells.

TLS Online TPP Program

#Id: 4780

#Unit 5. Developmental Biology

Wnt pathway is critical in establishing the anterior-posterior axis of C. elegans.

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#Id: 4781

#Unit 5. Developmental Biology

The P2 cell is also critical in giving the signal that distinguishes ABp from its sister, ABa

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#Id: 4782

#Unit 5. Developmental Biology

ABa gives rise to neurons, hypodermis, & anterior pharynx cells ABp makes only neurons and hypodermal cells

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#Id: 4783

#Unit 5. Developmental Biology

ABa and ABp are equivalent cells whose fates are determined by their positions in the embryo (if one experimentally reverses the positions of these two cells, their fates are similarly reversed and a normal embryo forms)

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#Id: 4784

#Unit 5. Developmental Biology

In an unperturbed embryo, both ABa and ABp contact the EMS blastomere, but only ABp contacts the P2 cell.