Question:

The complex formed by a pair of synapsed homologous chromosomes is called,

Updated On: Apr 9, 2025
  • Univalent
  • Pentavalent
  • Triad
  • Bivalent
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The Correct Option is D

Approach Solution - 1

During meiosis, homologous chromosomes pair up and form a structure called a bivalent (also known as a tetrad).

  • This occurs during prophase I of meiosis, where each chromosome is made up of two chromatids, and the homologous chromosomes undergo synapsis, the process where homologous chromosomes align closely and exchange genetic material via crossing over.
  • A bivalent consists of two homologous chromosomes, each made up of two chromatids, so there are a total of four chromatids in a bivalent.

Other options:

  • Univalent refers to a single chromosome that does not pair with its homologous chromosome during meiosis.
  • Pentavalent involves five chromosomes, which is not applicable to the synapsis of homologous chromosomes.
  • Triad refers to a group of three chromosomes, which is also not the case during synapsis.

The correct answer is (D) : Bivalent.

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Approach Solution -2

The correct answer is: (D) Bivalent.

During meiosis, homologous chromosomes pair up in a process called synapsis. The complex formed by a pair of synapsed homologous chromosomes is called a bivalent. This structure is essential for genetic recombination and ensures proper chromosome segregation during meiosis.

A bivalent consists of two homologous chromosomes, each made up of two sister chromatids, aligned closely together. The bivalent formation occurs during the prophase I stage of meiosis, and it is during this stage that crossing over (exchange of genetic material between chromatids) takes place, contributing to genetic diversity.

Therefore, the correct term for the complex formed by a pair of synapsed homologous chromosomes is bivalent.

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