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Common changes that occur in prophase of...

Common changes that occur in prophase of mitosis and prophase-I of meiosis are
I. Formation of bivalents
II. Condensation of chromatin
III. Chromosomal movement to poles
IV. Disappearance of nuclear membrane and nuclear membrane and nucleolus
V. Splitting of centromere

A

I, IV, V only

B

II, IV only

C

III, IV only

D

I, II, III only

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the common changes that occur in prophase of mitosis and prophase-I of meiosis, we need to analyze each of the provided options: 1. **Formation of bivalents**: This occurs specifically during prophase I of meiosis when homologous chromosomes pair up. In mitosis, there is no formation of bivalents. Therefore, this option is **incorrect** for both prophase of mitosis and prophase I of meiosis. 2. **Condensation of chromatin**: This is a common event in both prophase of mitosis and prophase I of meiosis. During this stage, chromatin condenses to form visible chromosomes. Thus, this option is **correct**. 3. **Chromosomal movement to poles**: Chromosomal movement towards the poles occurs during anaphase, not prophase. Therefore, this option is **incorrect** for both prophase of mitosis and prophase I of meiosis. 4. **Disappearance of nuclear membrane and nucleolus**: This is a common event that occurs in both prophase of mitosis and prophase I of meiosis. The nuclear membrane and nucleolus break down to allow the spindle fibers to interact with the chromosomes. Thus, this option is **correct**. 5. **Splitting of centromere**: The splitting of the centromere occurs during anaphase, not during prophase. Hence, this option is **incorrect** for both prophase of mitosis and prophase I of meiosis. ### Summary of Correct Options: - **Correct Options**: II (Condensation of chromatin) and IV (Disappearance of nuclear membrane and nucleolus). - **Incorrect Options**: I, III, and V. ### Final Answer: The common changes that occur in prophase of mitosis and prophase-I of meiosis are: - II. Condensation of chromatin - IV. Disappearance of nuclear membrane and nucleolus
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