Telophase I and Dyad Formation — NEET Biology
✅ Asked in NEET 2019After meiosis I, the resultant daughter cells have:
After meiosis I, the resultant daughter cells have:
Answer & NCERT explanation
Correct answer: A — Twice the DNA of a haploid gamete
After meiosis I, each daughter cell has half the chromosome number but each chromosome consists of two sister chromatids (unreplicated during interkinesis). Therefore, DNA content is twice that of a haploid gamete. A haploid gamete has single chromatids, while post-meiosis I cells have sister chromatid pairs, doubling the DNA content per chromosome.
Read more NCERT concept on the PYQ
Telophase I: The nuclear membrane and nucleolus reappear, cytokinesis follows and this is called as dyad of cells. Although in many cases the chromosomes do undergo some dispersion, they do not reach the extremely extended state of the interphase nucleus. The stage between the two meiotic divisions is called interkinesis and is generally short lived. There is no replication of DNA during interkinesis. Interkinesis is followed by prophase II, a much simpler prophase than prophase I.
Telophase I completes meiosis I by reforming the nuclear membrane and nucleolus, followed by cytokinesis to produce two haploid cells called a dyad. A critical trap: students confuse the interkinesis stage with interphase, thinking DNA replication occurs—it doesn't. DNA replication happens only before meiosis I. Another mistake is assuming chromosomes fully disperse like in G1 phase; they remain partially condensed during interkinesis. Remember: interkinesis is brief, has no DNA replication, and prophase II that follows is much simpler than prophase I. This concept tests understanding of the distinct phases separating the two meiotic divisions.
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