Final answer:
The formation of the bivalent during meiosis is the pairing of homologous chromosomes.
Step-by-step explanation:
The formation of the bivalent during meiosis is 1) The pairing of homologous chromosomes.
During prophase I, homologous chromosomes pair up to form a bivalent or a tetrad. This pairing allows for crossing-over, where genetic material is exchanged between the homologous chromosomes. Each bivalent consists of four chromatids, two from each homologous chromosome.