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Identify CORRECTLY matched pair....

Identify CORRECTLY matched pair.

A

Zygotene -Pairing of homologous chromosomes

B

Pachytene-Disjunction of hi homologous chromosomes

C

Diakinesis-Recombination of non sister chromatids of homologous chromosomes

D

Diplotene-Nucleolus disappears

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question of identifying the correctly matched pair from the given options, we will analyze each option step by step. ### Step 1: Analyze Option 1 - Zygotene - **Definition**: Zygotene is the second stage of prophase I in meiosis. - **Function**: During zygotene, homologous chromosomes begin to pair up and form synapses, which is the process of pairing. - **Conclusion**: This option is correctly matched as it describes the pairing of homologous chromosomes. ### Step 2: Analyze Option 2 - Pachytene - **Definition**: Pachytene is the third stage of prophase I in meiosis. - **Function**: In this stage, the paired homologous chromosomes become shorter and thicker, and crossing over occurs. - **Conclusion**: The statement that pachytene means disjunction of homologous chromosomes is incorrect. Therefore, this option is not correctly matched. ### Step 3: Analyze Option 3 - Diakinesis - **Definition**: Diakinesis is the fifth and last stage of prophase I in meiosis. - **Function**: In this stage, homologous chromosomes are fully separated, and the nuclear envelope breaks down. - **Conclusion**: The statement that diakinesis involves recombination of non-sister chromatids is incorrect. Thus, this option is not correctly matched. ### Step 4: Analyze Option 4 - Diplotene - **Definition**: Diplotene is the fourth stage of prophase I in meiosis. - **Function**: During diplotene, the homologous chromosomes begin to separate but remain connected at points called chiasmata. - **Conclusion**: The statement that the nucleus disappears during diplotene is incorrect. Therefore, this option is also not correctly matched. ### Final Conclusion The only correctly matched pair is: - **Option 1: Zygotene** - Correctly describes the pairing of homologous chromosomes.
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