Question

In which of the following stage, the chromosome
is single thin and like long thread ?
(a) Leptotene (b) Zygotene
(c) Pachytene (d) Diakinesis

Answer 1

Answer:

the correct answer is a) leptotene

Answer 2

Answer:

✔The correct answer is (a) Leptotene✔

Explaination:

☆ The Prophase-1 of the Meiosis-1 has following sub-phases:

➪Leptotene : It is the beginning of the prophase and the chromosomes appear as thin long threads. The condensation of chromosome is still not done by this phase.

➪ Zygotene : By this phase, the homologous chromosomes start pairing up and the chromosomes appear condensed and thick. The synaptonemal complex is also visible.

➪ Pachytene : This phase marks the exchange of parts between the non-sister chromatids of the homologous chromosomes called the crossing-over. The point of attachment of the non-sister chromatids, called the chiasma (pl. chiasmata) is also visible.

➪ Diakinesis : By this stage, the nuclear membrane and the nucleolus disppear and the homologous chromosomes move away from the point of the chiasma.

✪ Hence, the correct answer is 'Leptotene'. ✪

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