Question:

Synapsis occurs in ...... phase of meiosis :

Updated On: Sep 3, 2024

zygotene
diplotene
pachytehe
leptotene

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The Correct Option is A

Solution and Explanation

The pairing of homologous chromosomes during zygotene is called synapsis i.e., the homologous chromosomes which come from mother and father paired in zygotene. The synsaptonemal complex is also formed. The synaptonemal pair at the pachytene is commonly refered to as bivalents or dyads because it consists of two visible chromosomes or as tetrad because of four visible chromatids. The chromosomes at leptotene become more uncoiled and assume a long thread like shape. The centriole duplicate arid each daughter centriole migrates towards opposite pole. Diplotene is characterised by unpairing of homologous chromosomes. The synaptonemal complex appears to be dissolved leaving physicaly jointed discrete points called chiasmata. On these points crossing over took place.

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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