Question

Which of the following statements is true?
(i) Mitosis is preceded by one cycle of DNA replication and meiosis is preceded by two cycles of DNA replication.
(ii) In sexually reproducing organisms, meiosis is the only type of cell division observed.
(iii) Meiotic cell division is essential for the production of haploid gametes.

• A. All three statements are true
• B. Only (iii)
• C. Both (i) and (iii)
• D. Only (i)

Answer 1

The correct option is B Only (iii)

Meiosis is a type of cell division that occurs in the reproductive cells of sexually reproducing organisms. This reduces the chromosome number by half, resulting in the formation of haploid daughter cells. Since gametes are haploid, meiotic cell division is essential for the production of gametes.
While meiosis is essential for producing gametes in sexually reproducing organisms, it is not true that it is the only type of cell division seen.

Mitosis is the type of cell division in which a parent cell divides once to give rise to identical daughter cells. Mitosis also happens in sexually reproducing organisms for replacing dead cells, growth, etc.
Both mitosis and meiosis is preceded by a single cycle of cell division.