Xic is a complex genetic locus that expresses several long noncoding RNAs (ncRNAs). The most important of these is a gene called Xist (X  (X inactive specific transcript), which is stably expressed only on the inactive X chromosome.

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#Id: 10162

#Unit 6. System Physiology – Plant

The biosynthesis of gibberellins is under strict genetic, developmental, and environmental control, and numerous gibberellin-deficient mutants have been isolated. 

Mendel’s tall/dwarf alleles in peas are a famous example. Such mutants have been useful in elucidating the complex pathways of gibberellin biosynthesis.

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#Id: 9871

#Unit 6. System Physiology – Plant

The UVR8- COP1-SPA complex then activates the transcription of the major transcription factor HY5, which controls the expression of many of the genes induced by UV-B.

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#Id: 2582

#Unit 7. System Physiology – Animal

Late proximal tubule reabsorbs primarily NaCl.

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#Id: 4510

#Unit 13. Methods in Biology

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#Id: 1278

#Unit 7. System Physiology – Animal

Addison disease (primary adrenocortical insufficiency) caused by autoimmune destruction of all zones of the adrenal cortex.