Given below are two statements:
Statement I: Chromosomes become gradually visible under light micros

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Question

Given below are two statements:
Statement I: Chromosomes become gradually visible under light microscope during leptotene stage.
Statement II: The beginning of diplotene stage is recognized by dissolution of synaptonemal complex.
In the light of the above statements, choose the correct answer from the options given below:
(1) Both Statement I and Statement II are true
(2) Both Statement I and Statement II are false
(3) Statement I is true but Statement II is false
(4) Statement I is false but Statement II is true

Accepted Answer

Correct Answer: A — Both Statement I and Statement II are trueStep-by-step Solution:During prophase I of meiosis:Leptotene: Chromosomes start condensing and become gradually visible under a light microscope as thin threads. Statement I is true.Diplotene: The synaptonemal complex (which held homologous chromosomes together during pachytene) begins to dissolve, and chiasmata become visible. The beginning of diplotene is indeed marked by the dissolution of the synaptonemal complex. Statement II is true.Thus, both statements are true, corresponding to option A.Key Concepts: Meiosis prophase I stages: leptotene, zygotene, pachytene, diplotene, diakinesis. Synaptonemal complex formation and dissolution, chromosome visibility.

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