The enzyme Recombinase is required at which stage of Meiosis I?
Show Hint
Crossing over during meiosis increases genetic diversity in sexually reproducing organisms.
- Pachytene
- Zygotene
- Diplotene
- Diakinesis
The Correct Option is A
Approach Solution - 1
The enzyme Recombinase is required at Pachytene stage of Meiosis I.
(A) Pachytene - Correct: Recombinase (including RAD51 and DMC1) mediates crossing over during pachytene.
(B) Zygotene - Incorrect: Synapsis occurs here, but recombination happens later.
(C) Diplotene - Incorrect: Chiasmata become visible here, but recombination is complete.
(D) Diakinesis - Incorrect: This is the stage of terminalization of chiasmata.
The correct answer is (A) Pachytene, when homologous recombination occurs via recombinase enzymes.
Approach Solution -2
Recombinase is involved in the process of genetic recombination during meiosis. This process occurs during the pachytene stage of Meiosis I when homologous chromosomes exchange segments of genetic material. Recombination is crucial for generating genetic diversity.
Other stages:
- Zygotene is when homologous chromosomes begin to pair, but recombination does not occur.
- Diplotene and Diakinesis involve other aspects of chromosome behavior, but recombination is completed during pachytene.
Option (A) is correct as recombinase is active during the pachytene stage.
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