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  • The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?Option: 1 Zygotene<div class='qna

The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?

Option: 1

Zygotene


Option: 2

Pachytene


Option: 3

Diplotene


Option: 4

Diakinesis


Answers (1)

best_answer

The correct option is Option 2) Pachytene.

Recombination nodules, also known as recombination sites or synaptonemal complexes, are structures that facilitate the exchange of genetic material between homologous chromosomes during meiosis. These structures are important for genetic recombination and the generation of genetic diversity.

The appearance of recombination nodules occurs during the substage of prophase I called Pachytene. Prophase I is the longest and most complex phase of meiosis, consisting of several sub-stages: leptotene, zygotene, pachytene, diplotene, and diakinesis.

During Pachytene, homologous chromosomes pair up and undergo synapsis, where they become closely associated. The synaptonemal complex, which includes the recombination nodules, forms between the paired chromosomes. This complex helps to align the homologous chromosomes and promote the exchange of genetic material through a process called crossing over.

After Pachytene, the chromosomes continue to condense and undergo further changes in the subsequent sub-stages of prophase I, namely diplotene and diakinesis. In diplotene, the synaptonemal complex becomes more visible, and the homologous chromosomes begin to separate but remain connected at specific points called chiasmata. Diakinesis is the final sub-stage of prophase I, where the chromosomes fully condense and prepare for metaphase I.

Therefore, the appearance of recombination nodules occurs at the substage of prophase I called Pachytene, as stated in Option 2.

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manish painkra

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