At lower concentrations of activin, genes were not activated, and the “default” gene expression instructed the cells to become blood vessels and heart.

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#Id: 9187

#Unit 11. Evolution and Behavior

Positive Selection: The Spread of Beneficial Mutations

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#Id: 10315

#Unit 4. Cell Communication and Cell Signaling

Cancer cells influence the behavior of the fibroblasts and immune cells.

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#Id: 10476

#Unit 4. Cell Communication and Cell Signaling

Inherited a single mutant NF1 allele then develop neurofibromas, a benign tumor of the sheath cells that surround nerves, caused by loss of both alleles through LOH.

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#Id: 831

#Unit 4. Cell Communication and Cell Signaling

Necrotrophy where the plant cells are killed in advance of infection

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#Id: 8229

#Unit 10. Ecological Principles

Population distributions have five important characteristics

Geographic range

Abundance

Density

Dispersion

Dispersal