Cell Division and Continuous Life Processes — NEET Biology
📚 Practice ConceptAccording to the cell theory, cells arise from preexisting cells. The process by which this occurs is called cell division. Any sexually reproducing organism starts its life cycle from a single-celled zygote. Cell division does not stop with the formation of the mature organism but continues throughout its life cycle.
Which of the following statements are correct regarding the events and outcomes of meiosis in a diploid organism (2n chromosomes, 2C DNA in G1 phase)? S1. Prior to the initiation of Meiosis I, the cell undergoes S-phase, resulting in a chromosomal complement of 2n and a DNA content of 4C. S2. Meiosis I is a reductional division where homologous chromosomes separate, leading to the formation of two haploid cells, each containing n chromosomes and 2C DNA. S3. If a cell completes Meiosis I but subsequently skips Meiosis II, the two resulting cells will each possess n chromosomes, with each chromosome still composed of two chromatids. S4. The primary outcome of skipping Meiosis II would be the formation of gametes that are haploid in chromosome number but diploid in DNA content, which upon self-fusion could lead to an organism with tetraploid DNA content (2n, 4C). S5. The process of synapsis, chiasmata formation, and crossing over occur during Meiosis I, contributing to genetic variation irrespective of Meiosis II completion.
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