Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
Tetrads are structures formed during meiosis I when each chromosome pairs with its homologous partner. This pairing allows for the exchange of genetic material through a process called crossing over.
5 Must Know Facts For Your Next Test
Tetrads form during prophase I of meiosis.
Each tetrad consists of four chromatids.
The formation of tetrads allows for genetic recombination.
Synapsis is the process that brings homologous chromosomes together to form tetrads.
Chiasmata are the points where crossing over occurs within tetrads.
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Related terms
Synapsis: The pairing of homologous chromosomes during prophase I of meiosis.
Chiasmata: Sites where crossing over and exchange of genetic material occur between chromatids in a tetrad.
Homologous Chromosomes: Chromosome pairs, one from each parent, that are similar in shape, size, and genetic content.