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Question -

Describe the following:

(a) synapsis (b) bivalent (c) chiasmata

Draw a diagram to illustrate your answer.



Answer -

a) Synapsis – Homologous chromosomes pair together during Zygotene of prophase-I of meiosis. This pairing is called synapsis.
b) Bivalent or tetrad is the pair of complex formed by a pair of synapsed homologous chromosome during the zygotene of prophase I of meiosis.
c) Chiasmata
During diplotene, the paired chromosomes form an X-shaped structure known as chiasmata. At chiasmata, the crossing over between two non-sister chromatids takes place.

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