Question 8 of 10beginner🧠 RememberVery Short1 mark

Can you recall meiosis and indicate at what stage a recombinant DNA is made?

Correct Answer

Recombination occurs during the Pachytene stage of Prophase I of Meiosis I.

Exercise: EXERCISES | Q: 8 | (Page 15)
For More Understanding

Explanation

This question asks students to recall prior knowledge about meiosis from Class 11. During meiosis, homologous chromosomes pair up (synapsis) during Prophase I. The Pachytene stage is characterized by crossing over between non-sister chromatids of homologous chromosomes, resulting in the exchange of genetic material and formation of recombinant DNA/chromosomes. Note: The provided textbook context is from Chapter 9 (Biotechnology) and focuses on artificial recombinant DNA technology, not the natural process of meiosis.

Solution Steps

  1. Step 1: Recall that meiosis has two divisions - Meiosis I and Meiosis II

  2. Step 2: Prophase I of Meiosis I has five substages: Leptotene, Zygotene, Pachytene, Diplotene, and Diakinesis

  3. Step 3: Identify that crossing over (exchange of genetic material between homologous chromosomes) occurs during Pachytene stage

  4. Step 4: Conclude that this is when recombinant DNA/chromosomes are formed naturally

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