In meiosis crossing over is initiated at :
Show Hint
The Pachytene stage is characterized by the formation of the synaptonemal complex.
- Leptotene
- Zygotene
- Diplotene
- Pachetene
The Correct Option is D
Solution and Explanation
The Pachytene stage is characterized by the formation of the synaptonemal complex. This allows the exchange of genetic material between two homologous chromosomes by crossing over process. Initiation of crossing over occurs in the pachytene stage of prophase I of meiosis.
In meiosis crossing over is initiated at the pachytene stage.
- During Leptotene, chromosomes become gradually visible under a microscope. The chromosome compaction continues through this stage.
- During Zygotene, chromosomes start pairing together, known as synapsis.
- During Pachytene, bivalent chromosomes clearly appear. During this stage, the crossing over is initiated.
- During the Diplotene stage, the dissolution of synaptonemal takes place.
Therefore, the correct answer is Option A - Pachytene
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Concepts Used:
Cell Cycle and Cell Division
Cell Cycle:
The sequence of events by which a cell copies itself synthesizes other constituents of the cell and eventually splits into two daughter cells is termed the cell cycle. The cell synthesizes all its constituents in a sequential pattern to make sure the proper division and distribution of components that occurs between the two daughter cells. Therefore, we can say that the cell cycle is the period of time between the development of new daughter cells and their further division.
Stages of Cell Cycle:
The cell cycle can be sub-divided into an additional category of Interphase. Meanwhile, the Interphase can be branched into 3 further stages, such as:
- G1 Phase - “Gap 1 Phase”
- S Phase - "Synthesis Phase"
- G2 Phase - "Gap 2 Phase"
Read More: Cell Cycle and Cell Division
Cell Division:
The division of the parent cells into two or more cells is called daughter cell, cell division takes place. In general, it occurs as a part of a larger cell cycle. All the cell reproduces by dividing into two, wherein each parental cell produces two daughter cells.
Stages of Cell Division:
Cell division can be widely divided into several sub-segments that result from Mitosis and Meiosis.
- Mitosis or (M Phase)
- Meiosis