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#genetic regulation

3 public questions tagged with this topic.

Drosophila -ll

Genes controlling segment identity:

Segment number, polarity, and position established by gap, pair-rule, segment polarity hierarchy, but final morphological identity depends on homeotic selector genes clustered in Antennapedia and Bithorax complexes. These selectors encode homeodomain factors regulating batteries of realizator genes governing cuticle pigmentation, bristle pattern, limb type, and nervous connectivity. Gap genes specify regions, pair-rule provide periodicity, segment polarity maintains borders, none confer segment-specific character. Homeotic selectors act downstream interpreting segmental address and executing d

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 20: Homeotic selector genes - ANT-C and BX-C conferring segment identity.

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DNA

Which of the following statements about Z-DNA is correct?

It has alternating purine-pyrimidine sequences is the scientifically accurate answer to this question. Within the study of DNA, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of It has alternating purine-pyrimidine sequences directly address what is being asked. Among the other options, It is the predominant form of DNA in cells, It is right-handed, and It is found in single-stranded DNA do not correctly answer this question because they either refer to different concepts,

Ref: Molecular Biology of the Gene, Watson et al., 7th Ed.

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