SarkariPYQ

SSC Selection Post 2024 PYQ — Question 45

SSC Selection Post - Matriculation Level - 21 June 2024 - Shift 1 • General Awareness • Q45

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Which chromosome is involved in the production of ‘masked’ mRNAs for early development?

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Correct answer: B

Explanation

The correct answer is option 2 i.e. Lampbrush chromosome.

  • Lampbrush chromosome is involved in the production of ‘masked’ mRNAs for early development.
  • Lampbrush chromosomes are highly enlarged chromosomes characterized by the presence of extended, filamentous loops projecting from dense chromomeres. These loops are sites of active transcription.

  • Lampbrush chromosomes are found in the oocytes of birds, lower vertebrates, and some invertebrates during the prolonged prophase of the first meiotic division. They have also been observed in certain plant species.

  • These chromosomes appear specifically during the diplotene stage of prophase I of meiosis. At this stage, they exist as meiotic bivalents, with each bivalent composed of two pairs of sister chromatids.

  • The study of lampbrush chromosomes has yielded important information about the organization and function of chromatin and the regulation of gene expression.