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Place the Following Meiotic Events in Order. A. __ Lining-up of Tetrads at the Equatorial Plate B. __ Complete De -condensation C. __

Question

Place the following meiotic events in order. a. __ lining-up of tetrads at the equatorial plate b. __ complete de -condensation C. __ crossing-over d. __ DNA replication e. __ dyad formation f. __ interphase g. __ migration of chromatids h. __ migration of homologous pairs i. __ partial de -condensation j. __ separation of homologous chromatids k. __ tetrad formation

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Answer

Here's the correct order of meiotic events:1. **f. Interphase:** This occurs *before* meiosis begins. DNA replication happens during the S phase of interphase.2. **d. DNA replication:** Chromosomes duplicate, creating sister chromatids.3. **k. Tetrad formation:** Homologous chromosomes (each consisting of two sister chromatids) pair up.4. **c. Crossing-over:** Non-sister chromatids within a tetrad exchange genetic material.5. **a. Lining-up of tetrads at the equatorial plate:** Tetrads align in the center of the cell during Metaphase I.6. **h. Migration of homologous pairs:** Homologous chromosomes separate and move to opposite poles of the cell during Anaphase I.7. **e. Dyad formation:** Each pole now has a haploid set of chromosomes (still consisting of two sister chromatids). This marks the end of Meiosis I.8. **i. Partial de-condensation:** Chromosomes may slightly decondense between Meiosis I and II, but not fully.9. **Lining-up of dyads at the equatorial plate (not listed, but important):** Chromosomes line up at the equator during Metaphase II.10. **j. Separation of homologous chromatids:** Sister chromatids separate and move to opposite poles during Anaphase II.11. **g. Migration of chromatids:** This is essentially the same as the previous step; chromatids (now considered individual chromosomes) have migrated to opposite poles.12. **b. Complete de-condensation:** Chromosomes decondense, returning to their interphase form. This occurs after the completion of Meiosis II, as the newly formed cells enter interphase.Therefore, the ordered list using the given letters is: f, d, k, c, a, h, e, i, j, g, b.