NEET Biology question
Refer to the following statements describing prophase I of meiosis: (i) Thin thread-like chromosomes with a beaded appearance (ii) Appearance of recombination nodules (iii) Formation of bivalents/tetrads (iv) Terminalisation of chiasmata (v) Appearance of chiasmata
Identify the different stages with respect to the above given features and select the correct option.
Solution
(i) Thin, single, bead-like threads describe Leptotene, the first substage, before pairing occurs. (ii) Recombination nodules — the physical sites of crossing over — appear during Pachytene, when non-sister chromatids actively exchange segments. (iii) Bivalents/tetrads are formed when homologous chromosomes synapse,
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