Threshold characteristics display only two possible phenotypes—the trait is either present or absent.

TLS Online TPP Program

#Id: 10289

#Unit 4. Cell Communication and Cell Signaling

T-cell lineage

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#Id: 10468

#Unit 4. Cell Communication and Cell Signaling

Subsequent loss or inactivation of the remaining normal allele in a somatic cell, known as loss of heterozygosity causes cancer to develop.

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#Id: 3059

#Unit 10. Ecological Principles

The species-area hypothesis S = c Az

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#Id: 9675

#Unit 4. Cell Communication and Cell Signaling

PDK1 can phosphorylate PKB on a critical threonine residue in its activation loop

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#Id: 4747

#Unit 5. Developmental Biology

Sperm microtubules protect PAR-2 protein from phosphorylation, allowing it to enter the cortex along with its binding partner, PAR-1.