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Question
Cross-like configurations, when non-sister chromatids of a bivalent come in contact during first meiotic division are
Cross-like configurations, when non-sister chromatids of a bivalent come in contact during first meiotic division are
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Solution
The correct option is D Chiasmata
In diplotene, the nucleoprotein fusion complex of the synapsed chromosomes dissolves. The homologous chromosomes start separating except in the region of crossing over. It makes chromatids more distinct and the tetrads very clear. The point of attachment between the homologous chromosomes after the partial dissolution of nucleoprotein complex are called as chiasmata. The chiasmata marks the sites of crossing over. Chiasmata may be terminal or interstitial. Depending upon their position, the homologous chromosomes appear cross-like ring or chain-like. However, they are not permanent structures. They slide sideways or even disappear at places.
In diplotene, the nucleoprotein fusion complex of the synapsed chromosomes dissolves. The homologous chromosomes start separating except in the region of crossing over. It makes chromatids more distinct and the tetrads very clear. The point of attachment between the homologous chromosomes after the partial dissolution of nucleoprotein complex are called as chiasmata. The chiasmata marks the sites of crossing over. Chiasmata may be terminal or interstitial. Depending upon their position, the homologous chromosomes appear cross-like ring or chain-like. However, they are not permanent structures. They slide sideways or even disappear at places.
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