Prophase I
Definition
Prophase I is the first phase in meiosis I where chromosomes condense, homologous chromosomes pair up to form tetrads, and crossing over occurs.
Analogy
Think of Prophase I as the preparation phase for a big dance party. The chromosomes (guests) are getting ready (condensing), finding their dance partners (pairing up), and swapping dance moves (crossing over).
Related terms
Tetrad: A tetrad is a four-part structure that forms during the prophase of meiosis and consists of two homologous chromosomes, each composed of two sister chromatids.
Synapsis: Synapsis is the pairing of two homologous chromosomes that occurs during meiosis. It allows matching-up of homologous pairs prior to their segregation.
Chiasmata: Chiasmata are the points where crossing over occurs between two nonsister chromatids in a tetrad during meiosis.
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