Question

The enzyme recombinase is required at which stage of meiosis?

• A. Pachytene
• B. Zygotene
• C. Diplotene
• D. Diakinesis

Answer 1

The correct option is A

Pachytene

The correct option is A.

Explanation of the correct option:

Pachytene:

1. Enzyme recombinase is required in this stage of meiosis 1 of prophase1.
2. It is in this stage that the process of synapsis is complete and the two homologous chromosomes get attached to each other the point of this attachment is known as Chiasma.
3. A very important process of crossing over also takes place in this stage only.
4. The enzyme recombination helps in recombining the chromosomes and at this stage only new genetic variations in the population are possible.

Explanation of the incorrect options:

Option B:

Zygotene:

1. In this process, the two homo Logus chromosomes begin to pair with each other and this process ends with the complete pairing of both the chromosomes.
2. The process of pairing between two chromosomes is called synapsis.

Option C:

Diplotene:

1. In diplotene, the DNA recombination process gets completed.
2. The chromatids keep on shortening and beginning and form a group called a tetrad.
3. The synaptonemal complex begins breaking down.

Option D:

Diakinesis:

1. In this stage, The chromosomes become to shorten and thicken.
2. The nucleolus and nuclear envelope disappear towards the end of the stage.
3. The spindle apparatus becomes organized.
4. Centrioles migrate away from one another.

Final answer: The enzyme recombinase is required in pachytene.