1. Tardigrade
  2. Question
  3. Biology
  4. From the following, identify the two correct statements with reference to meiosis. I. Meiosis involves two sequential cycles of nuclear and cell division called meiosis I and meiosis II but only a single cycle of DNA replication. II. Development of chiasmata occurs in diakinesis. III. Separation of two basic sets of chromosomes. IV. No division of centromere.

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Q. From the following, identify the two correct statements with reference to meiosis.
I. Meiosis involves two sequential cycles of nuclear and cell division called meiosis I and meiosis II but only a single cycle of DNA replication.
II. Development of chiasmata occurs in diakinesis.
III. Separation of two basic sets of chromosomes.
IV. No division of centromere.

NTA AbhyasNTA Abhyas 2020Cell Cycle and Cell Division

Solution:

The beginning of diplotene is recognised by the dissolution of the synaptonemal complex and the tendency of the recombined homologous chromosomes of the bivalents to separate from each other except at the sites of crossovers. These X-shaped structures, are called chiasmata.
Anaphase II: It begins with the simultaneous splitting of the centromere of each chromosome (which was holding the sister chromatids together), allowing them to move toward opposite poles of the cell by shortening of microtubules attached to kinetochores.