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question 68

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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?

Definitions:

Bargaining

The negotiation process between two or more parties to reach a mutually acceptable agreement.

Kubler-Ross's Typology

Denotes the five stages of grief as proposed by Elisabeth Kübler-Ross, encompassing denial, anger, bargaining, depression, and acceptance.

Denial

A psychological defense mechanism where a person refuses to accept reality or facts, thereby avoiding a potentially distressful situation.

Kubler-Ross's Typology

A model describing five stages of emotional response to grief and loss, namely denial, anger, bargaining, depression, and acceptance.