Question

Select the correct matched pair.
1) S phase - DNA replication
2) Zygotene – Synapsis
3) Diplotene - Crossing over
4) Meiosis - Both haploid and diploid cell
5) G2​ phase - Quiescent stage
A) (1) and (2) only
B) (3) and (4) only
C) (3) and (5) only
D) (5) and (4) only

Answer 1

Hint:A cell cycle is a process in which several events occur in a cell as it grows and divides. Cells mostly spend time in the phase called interphase because in this phase cells grow, multiply and divide after that goes into mitosis and the resulting cell is called daughter cell.
DNA replication, producing two similar copies of DNA from one original DNA molecule. DNA replication takes place in all living organisms.

Complete answer:
A cell cycle consists of two phases. They are interphase and division phase.
The interphase is the prolonged phase of cell cycle. It is made up of three phases:- growth phase, S phase and second growth phase.
The S phase is the synthesis phase; s stands for synthesis in which DNA replication occurs.
The cell division meiotic division occurs in two steps: meiosis I and meiosis II.
The meiosis I has several stages like prophase I, metaphase I, anaphase I and telophase I. The prophase I is further completed into various stages- substages - leptotene, zygotene, pachytene, diplotene and diakinesis. The chromosomes coil at the leptotene stage then homologous chromosomes make pairs at the zygotene stage. The combining of similar chromosomes is called synapsis and moves forward by crossing over in the pachytene stage.

So, the correct answer is (1) and (2) only.

Note:In Diplotene, crossing over does not occur but it terminates the process. Meiosis only takes place in the diploid cell not in both haploid and diploid cells. Quiescent stage is called the G zero phase which is the resting phase.