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Healthy individuals of Paramecium bursaria contain photosynthetic algal endosymbionts of the genus Chlorella. When within their hosts, the algae are referred to as zoochlorellae. In aquaria with light coming from only one side, P . bursaria gather at the well-lit side, whereas other species of Paramecium gather at the opposite side. The zoochlorellae provide their hosts with glucose and oxygen, and P. bursaria provides its zoochlorellae with protection and motility. P . bursaria can lose its zoochlorellae in two ways: (1) if kept in darkness, the algae will die; and (2) if prey items (mostly bacteria) are absent from its habitat, P. bursaria will digest its zoochlorellae.
Which process in Paramecium results in genetic recombination but no increase in population size? (A) budding (B) meiotic division (C) conjugation
(D) binary fission

In conjugation, genetic material is transferred between two complimentary paramecia (syngen). Asexual reproduction must occur 50 times before conjugation can occur. The conjugation bridge is created during the conjugation process, and the connected paramecia are referred to as conjugants.

Conjugation occurs sexually in ciliates like Paramecium, where it causes nuclear restructuring and genetic recombination. A bridge between the cytoplasms of two Paramecia of the same mating type occurs during conjugation.

There are two important benefits to conjugation for paramecium.

Genetic resources are transferred between the compatible mating types during conjugation. Due to genetic recombination, it causes genetic heterogeneity in the progeny people.

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