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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#Unit 3. Fundamental Processes

A nucleus injected into a Xenopus egg can replicate only once unless the nuclear membrane is permeabilized to allow subsequent replication cycles

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#Unit 6. System Physiology – Plant

Type II phytochromes, these phytochromes are also present in etiolated plants. The reason is that the expression of their mRNAs is not significantly changed by light, and the encoded phyB through phyE proteins are more stable in the Pfr form than is PfrA.

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#Unit 5. Developmental Biology

Two regions of Drosophila chromosome III contain most of homeotic genes: Antennapedia complex Bithorax complex

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#Unit 8. Inheritance Biology

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#Unit 13. Methods in Biology

One simply harvests cellular RNA containing the transcript whose 59-end is to be mapped and whose sequence is known.