In pachytene stage of meiosis, the chromosomes appear

Single stranded

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Double stranded

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Three stranded

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Four stranded

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Solution

The correct option is A Four stranded
During pachytene stage, there is formation of recombination nodules between homologous chromosomes, each pair is called bivalent. Each homologue of a pair is actually composed of two sister chromatids and the pair is a tetrad of chromatids, i.e., four stranded.

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Similar questions

1. Chromosome condensation
2. Chromosome synapse
3. Tetrad
4. Crossing over
5. Chiasmata
6.Chromosome segregation

Column I	Column II
A. Pachytene	(i) Synapsis
B. Anaphase I	(ii) Terminalisation of chiasmata
C. Diakinesis	(iii) Crossing over
D. Zygotene	(iv) Homologous chromosomes separate

Column I	Column II
A. Pachytene	(i) Synapsis
B. Anaphase I	(ii) Terminalisation of chiasmata
C. Diakinesis	(iii) Crossing over
D. Zygotene	(iv) Homologous chromosomes separate

Regarding the assertion and reason; choose the correct option_____.

Assertion [A]: Prophase I of Meiosis I is the longest phase during the formation of gametes.

Reason [R]: It has five sub stages Leptotene, Zygotene, Pachytene, Diplotene and

Diakinesis; during which the number of chromosomes are doubled.

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