.......... is a point at which crossing over has taken place between homologous chromosomes.

Chiasmata

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Synaptonemal complex

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Centromeres

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Protein axes

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Solution

The correct option is C Chiasmata
Meiosis comprises of two divisions meiosis I and meiosis II. The meiosis I occur in following stages, prophase I, metaphase I, anaphase I and telophase I. Homologous chromosomes pair during meiosis I. Crossing over occurs during meiosis I, this is called as synapsis. The synapsis occurs between homologous chromosomes and facilitates crossing over. The exact point of crossing over is revealed by formation of cross-shaped structures or chiasma formation during prophase I.
So, the correct answer is option A.

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The points at which crossing over has taken place between homologous chromosomes are called synaptonemal complexes.

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Q. Name the stage of cell cycle at which one of the following events occur.
(i) Chromosomes are moved to spindle equator.
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Name the stage of the cell cycle at which one of the following events occur:

(i) Chromosomes are moved to the spindle equator
(ii) Centromere splits and chromatids separate
(iii) Pairing between homologous chromosomes takes place
(iv) Crossing over between homologous chromosomes takes place

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