Chiasmata formation and crossing over takes place in sub-stage:
Correct answer: C. Pachytene
- A. Leptotene
- B. Zygotene
- C. Pachytene
- D. Diplotene
- E. Diakinesis
Explanation
Chiasmata formation and crossing over take place during the sub-stage Pachytene in meiosis. Here's an explanation of each of the sub-stages you mentioned:1. Zygotene: In this sub-stage, homologous chromosomes start to come together but do not yet physically connect. It's the beginning of synapsis.2. Leptotene: This is the initial sub-stage of meiosis, where chromosomes start to condense and become visible under a microscope.3. Diakinesis: In Diakinesis, chromosomes continue to condense, and chiasmata (the points where crossing over occurs) become more evident.4. Diplotene: This is when the homologous chromosomes start to separate, but they remain connected at the chiasmata due to genetic recombination.5. Pachytene: Pachytene is the sub-stage where chiasmata formation and crossing over occur. During this phase, homologous chromosomes are fully connected at chiasmata, facilitating genetic exchange between chromatids. This is a crucial step in introducing genetic diversity into the offspring.So, the answer to your question is Pachytene.
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