When does synapsis occur during meiosisa)Leptoteneb)Zygotenec)DiploteneD)PachyteneCorrect answer is option 'B'. Can you explain this answer?

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Same problem...answer should be (d)zygotene.But here the answer is given pachytene,which is wrong

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Answer should be  the option b. zygotene

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Option D is correct during Zygotene stage synopsis is takes place, phachtin stage crossing over takes place (exchange of genetic material), diplotin stage chiasmata is formed, leptotene stage chromosomes contains two sister cromatids and more clearly visible in the nucleo plasm.

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Synapsis during Meiosis

Synapsis is the process of pairing of homologous chromosomes during meiosis I. It occurs during the prophase I stage of meiosis. Prophase I is the longest phase of meiosis, and it can be further divided into five substages: leptotene, zygotene, pachytene, diplotene, and diakinesis.

Zygotene
Synapsis begins during the zygotene stage of prophase I. During this stage, the homologous chromosomes start to pair up with each other. This pairing occurs due to the formation of synaptonemal complexes between the homologous chromosomes. The synaptonemal complex is a protein structure that holds the homologous chromosomes together.

Pachytene
After the zygotene stage, the pachytene stage follows. During this stage, the homologous chromosomes further condense and thicken. The synaptonemal complex helps to align the chromosomes precisely and facilitate the exchange of genetic material between non-sister chromatids. This exchange is known as crossing over, which leads to genetic recombination.

Leptotene, Diplotene, and Diakinesis
Before zygotene, during the leptotene stage, the chromosomes start to condense and become visible under a microscope. In the diplotene stage, the synaptonemal complex starts to break down, and the homologous chromosomes begin to separate from each other. This separation is known as desynapsis. Finally, during the diakinesis stage, the chromosomes continue to condense, and the nuclear envelope and nucleolus start to disappear.

Conclusion
In conclusion, synapsis occurs during the zygotene stage of meiosis I. It is a crucial step that allows for the precise pairing and alignment of homologous chromosomes, leading to genetic recombination and the formation of genetically diverse gametes.

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Answer is zygotene man

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Zygotene is the sub stage where synapsis between homologous chromosomes begins.It is also known as zygonema.These synapsis can form up and down the chromosomes allowing numerous points of contract called 'synaptonemal complex'

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Synapsis occurs in the zygotene stage of prophase 1 of meiosis 1.....

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Synapsis paring of two  homologous chromosome in zygotene stage  (prophase).

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In meiosis I synapsis formation occurs in the zygotene stage of prophase-I.  During this stage the chromosomes start pairing together and this process of association called synapsis. Such paired chromosomes are called homologous chromosomes.Option D is correct.

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Synapsis is the pairing of homologous chromosome with the formation of synaptonemal complex and it occurs in zygotene of prophase.

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The correct answer is zygotene as mentioned in ncert.

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Correct ans. is zygotene...not pachytene.

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Zygotene  is crt

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Answer is zygotene in which homologous chromosome start pairing together they form synapsis and the complex associated with them is synaptonimal complex
while in pachytene crossing over occur between non sister chromatics of homologous chromosome so answer
d is right

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Pairing of two homologous is called synapsis that occur in zygotene stage of prophase so ans. is d).

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Correct anwser is Zygotene

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Synapsis is the pairing of two homologous chromosomes that occur during meiosis it allows matching up homologous pair prior to their segregation and cross over between them. and this is seen in zygotene stage of prophase.

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Bio is purely based on facts . Its a fact !! you have to learn simply .Its a part of the process
No explanation

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