Computer case

4 important questions on Computer case

Explain the effect of transcription factor dimerization on regulation of gene expression in comparison to monomeric transcription factors.

With monomeric transcription factors, each transcription factor translates to one characterization or expression, whereas with dimerization, there is more possibilities for combining of transcription factors to regulate different expressions.

Which class of floral organ identity genes is shown to be present in gymnosperms and what is thought to be their role in these plants?


Classes A and B and they are present to identify the cone as being male or female. AB is male and A is female.

In Arabidopsis, we create a new mutant line; we mutate the binding box of AGAMOUS (AG) in the APETALA1 promoter in such that AG cannot bind to this promoter anymore. What would be the phenotype of the resulting plant and why?

AGAMOUS can not, in this case, inhibit APETELA1, but APETELA1 can inhibit AGAMOUS, which results in the expression of APETELA1 in all 4 layers. This plant will express sepals and petals.
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What is the mutant phenotype of the Apetala1 (A type), Apetala3 (B type) double mutant?

The phenotype is all 4 layers are carpels. This is deducted from the following:
· A mutant: no sepals and petals, cannot repress C
· B mutant: no petals and stamen

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