Question

Give the name of the phases of meiosis, in which
I. the chromosome number is reduced to haploid state.
II. the amount of DNA is reduced to haploid state.

• A. Anaphase-II, Anaphase-I
• B. Anaphase-I, Metaphase-II
• C. Anaphase-I, Anaphase-II
• D. Anaphase-II, Metaphase-I

Answer 1

The correct option is C Anaphase-I, Anaphase-II

The genetic material (DNA) will be doubled only in the S phase (Synthesis phase) before Meiosis I and the cell after Meiosis I starts directly Meiosis II without going through a S phase. So, the genetic material is doubled only once during the entire meiotic cell division.

During the Anaphase I of Meiosis I, the homologous chromosomes separates to the opposite poles so that at the end of Meiosis I, the number of chromosomes at both ends will be reduced to haploid state. But as the DNA is doubled at the beginning of Meosis I, effective amount of DNA is not reduced from parent cell at both ends.

During Anaphase II of Meosis II, the sister chromatids of chromosomes separate causing reduction in the amount of DNA to haploid state, as the DNA is not doubled before the start of Meiosis II.

Thus the correct option is "(C) Anaphase-I, Anaphase-II".