In Vulval Development in Caenorhabditis Elegans (A Soil Nematode), the Progenitor

question 90

Multiple Choice

In vulval development in Caenorhabditis elegans (a soil nematode) , the progenitor cell nearest to the anchor cell is exposed to the highest concentration of epidermal growth factor and activation of its EGF receptor promotes type 1 cell differentiation. The type 1 cell then prevents type 1 differentiation in adjacent progenitor cells, a mechanism called:

• A)lateral inhibition.
• B)hierarchical control.
• C)combinatorial control.
• D)downstream element inhibition.
• E)loss-of-function mutation.

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