When homologous chromosomes match up they form a structure called tetrad.
What are homologous chromosomes?
- "Homologous chromosomes, are a set of one maternal and one paternal chromosome that pair up with each other inside a cell during fertilization."
What do you mean by triad?
- "During meiosis, each pair of chromosomes—called a tetrad, or a bivalent—consists of four chromatids. At this point, the homologous chromosomes exchange genetic material by the process of crossing over."
Hence, the answer is tetrad.
To know more about homologous chromosomes here
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