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Principles Of Inheritance And Variation

Question
CBSEENBI12003302
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When paternal and maternal chromosomes change their materials with each other in cell division this event is called

  • synapsis

  • crossing over

  • bivalent forming

  • dyad- forming

Solution

B.

crossing over

Crossing over is the mutual exchange of segments of homologous chromatids during first meiotic prophase.

Synapsis is the fusion of chromosome pairs at the start of meiosis.

DNA replication precedes the start of Meiosis I. During Prophase I, homologous chromosomes pair and form synapses. The paired chromosomes are called bivalents and the formation of chiasmata caused by genetic recombination becomes apparent.

Dyad formation is a double chromosome resulting from the splitting of a tetrad during meiosis (germ cell formation).

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