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Metaphase One

During metaphase I, homologous chromosomes pair up and line up in the middle of a dividing cell

Homologous chromosome pairing: Homologous chromosomes pair up in a process called synapsis. Homologous chromosomes contain matching alleles from the mother and father

Crossing over: Also known as meiotic recombination, crossing over occurs during metaphase I. This process shuffles the characteristics of the two parents, creating genetic variation

Random orientation: The position of the homologous pairs on the metaphase plate is random. This means that the daughter cells have a 50-50 chance of inheriting 50-50 characters from each parent

Spindle fiber attachment: Spindle fibers attach to the centromere of each chromosome

Bivalent metaphasic plate: The two centromeres of each homologous pair create a bivalent metaphasic plate

Pushing bodies: Interzonal spindle fibers push the chromosomes to opposite poles of the cell

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