During meiosis, homologous chromosomes pair up and form a structure called a bivalent (also known as a tetrad).
Other options:
The correct answer is (D) : Bivalent.
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.