The force accompanying the movement of Delta into the signaling cell stretches the Notch protein on the responding cell and allowing access by ADAM 10, which cleaves the Notch extracellular domain

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#Id: 9559

#Unit 11. Evolution and Behavior

Mutationist - Theories were advanced by some geneticists who observed that discretely different new phenotypes can arise by a process of mutation.

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#Id: 7362

#Unit 5. Developmental Biology

In the presence of Nodal, the Pitx2 gene is activated

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#Id: 8657

#Unit 10. Ecological Principles

Competition as a negative interaction between two species that depend on the same limiting resource to survive, grow, and reproduce.

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#Id: 3861

#Unit 5. Developmental Biology

When the ratio of PSF relative to that of bacteria exceeds a certain threshold, cells stop proliferating and initiate the expression of genes that are required for their aggregation.

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#Id: 6906

#Unit 8. Inheritance Biology

Q bands staining with quinacrine mustard and viewing the under ultraviolet light;  variation in the brightness of Q bands results from differences in the relative numbers of C-G and A-T base pairs.