The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?
The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?
Pachytene
Diplotene
Diakinesis
Zygoten
The Correct Option is A
Solution and Explanation
Recombination nodules, also known as synaptonemal complex, play a crucial role in the crossing-over and recombination of genetic material between homologous chromosomes. Pachytene is the stage of prophase I during which homologous chromosomes are closely paired and synapsed, and recombination nodules become visible under microscopy.
Therefore, The correct option is (A): Pachytene
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Concepts Used:
Meiosis
Meiosis is a process in which a single cell, a diploid cell, undergoes division twice to produce four haploid daughter cells, and the cells produced are known as the sex cells or gametes (sperms in males and egg in females). It contains half of the original amount of genetic information. The haploids only have half the number of chromosomes of the parent cell.
Features of Meiosis:
- It results in the formation of four daughter cells in each cycle of cell division.
- The daughter cells are identical to the mother cell in shape and size but different in chromosome number.
- The daughter cells are haploid.
- Recombination and segregation take place in meiosis.
- The process occurs in the reproductive organs and results in the formation of gametes.
- The process is divided into two types-Meiosis-I reduces the chromosome number to half and is known as reductional division. Meiosis-II is just like the mitotic division.
Phases of Meiosis
Meiosis can be divided into nine stages. The process is usually divided into two parts. The first time a cell divides (meiosis I) and the second time it divides (meiosis II). The phases are as follows –
Meiosis 1 Stages
The different stages of meiosis 1 can be explained by the following phases :
- Prophase 1
- Metaphase 1
- Anaphase 1
- Telophase 1
Meiosis 2 Stages
The different stages of meiosis 1 can be explained by the following phases :
- Prophase 2
- Metaphase 2
- Anaphase 2
- Telophase 2