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How does conjugation in Paramecium create genetic variation?
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Sequential changes in the position of the child during labour.
In Paramecium, conjugation is a sexual process that facilitates genetic reorganization rather than reproduction. It creates genetic variation through the following steps:12
- Meiosis: When two compatible mating types unite, the micronucleus in each cell undergoes meiosis, resulting in the production of haploid micronuclei.2
- Nuclear Exchange: Most of these haploid nuclei disintegrate, leaving one that divides by mitosis into two gametic nuclei. A cytoplasmic bridge forms between the organisms, allowing for the reciprocal exchange of these gametic nuclei.21
- Fertilization: The exchanged gametic nucleus fuses with the stationary gametic nucleus remaining in the cell, restoring the diploid chromosome number. This union of genetic material from two different individuals creates new genetic combinations.21
Following this exchange, the fused nuclei divide to form new micronuclei and macronuclei, effectively rejuvenating the organisms and ensuring the continuation of the species through subsequent binary fission.12