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Question

______ is the X-shaped structure which is formed when the recombined homologous chromosomes separate from each other except at the sites of crossover.

A
Chiasmata
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B
Bivalent
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C
Tetrad
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D
Synaptonemal complex
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Solution

The correct option is A Chiasmata
The chiasmata is the X-shaped structure which is formed when the recombined homologous chromosomes separate from each other except at the sites of crossover. It is seen during the diplotene stage of prophase I of meiosis I.

During the zygotene stage of prophase I of meiosis I, the homologous chromosomes begin to pair up by a process called synapsis. The synapsed homologous chromosomes are called bivalents or tetrads. This is also associated with the formation of the synaptonemal complex.

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