The transition from specification to determination in Drosophila is mediated by Segmentation genes.

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#Id: 4754

#Unit 5. Developmental Biology

The determination of the P1-derived somatic founder cells (MS, E, C, and D)are autonomous, with cell fates determined by internal cytoplasmic factors SKN-1, PAL-1, and PIE-1

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#Id: 983

#Unit 5. Developmental Biology

Nodal protein establishes left-right polarity, By activating Pitx2 on the left side

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#Id: 1692

#Unit 4. Cell Communication and Cell Signaling

Recognition of Recombination Signal Sequence (RSS) by the RAG1/RAG2 enzyme complex.

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#Id: 9189

#Unit 11. Evolution and Behavior

Overdominance the heterozygote has higher fitness than the  fitnesses of the two homozygotes

Underdominance, in which the heterozygote has lower fitness than both homozygotes.

Directional selection leads to fixation of the favored allele and elimination of the other allele, as  long as no other evolutionary forces act on the population.

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#Id: 1075

#Unit 5. Developmental Biology

Class C activity alone specifies carpels.