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Solution


Q.

Select the correct statements:         [2023]

A. Tetrad formation is seen during Leptotene.
B. During Anaphase, the centromeres split and chromatids separate.
C. Terminalization takes place during Pachytene.
D. Nucleolus, Golgi complex, and ER are reformed during Telophase.
E. Crossing over takes place between sister chromatids of homologous chromosomes.

Choose the correct answer from the options given below:
1 A, C, and E only  
2 B and E only  
3 A and C only  
4 B and D only  

Ans.

(4)

Bivalent is formed during zygotene stage of prophase I. The four chromatids of each bivalent chromosome become distinct and clearly visible as tetrad during pachytene of prophase I. Terminalisation of chiasmata occurs during diakinesis of prophase I. Crossing over is the exchange of genetic material between non-sister chromatids of the homologous chromosomes.