Question

The prophase i stage of meiosis plays a vital role in r-dna formation. Justify with reason. Class 12

Answer 1

Meiosis involves chromosomes whereby they segregate into prophase one and prophase two. Prophase plays a vital role in dna formation in that it involves separation of identical genetic information which is usually carried by the nucleus in the parental cell which results in to two daughters. During prophase chromatin condenses. CMM

Answer 2

The prophase I stage of meiosis plays a vital role in r- DNA formation because the crossing between non-sister chromatids takes place in this phase.

Explanation:

• Meiosis a reduction cell division which takes places in the reproductive cells (Sperms , eggs).
• In this division, the diploid number of chromosomes is reduced to haploid number of chromosomes.
• At the end of meiosis, four haploid daughter cells are formed.
• It is essential for sexual reproduction in all eukaryotes.
• It occurs in two stages including meiosis I and meiosis II.
• Meiosis I include Prophase I, Metaphase I, Anaphase I, Telophase I , Cytokinesis I.
• Meiosis II include Prophase II, Metaphase II, Anaphase II, Telophase II , Cytokinesis II.
• In Prophase I, there are 5 stages including Leptotene, zygotene, pachytene, diplotene, and diakinesis.
• In Pachytene stage, crossing over takes place between non-sister chromatids of two homologous chromosomes which results in genetic variation.

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