Final answer:
A mutation preventing the formation of recombination nodules would make an individual less fit due to reduced genetic diversity, which is key for adaptation and survival. Recombination during meiosis introduces new gene combinations that are advantageous for a population, especially in new environments.
Step-by-step explanation:
An individual with a mutation preventing the formation of recombination nodules would be considered less fit than others primarily due to reduced genetic diversity. Recombination nodules are essential during meiosis for facilitating crossing over between homologous chromosomes. This exchange of genetic material increases genetic variability in a population, which is crucial for adaptation to changing environments. Without the ability to form recombination nodules, crossing over would not occur, thereby reducing an individual’s contribution to the genetic diversity of their offspring. This can lead to a decrease in adaptability and potentially reduced reproductive success in varied environments, making those individuals less fit.
Crossing over primarily occurs during prophase I of meiosis to enhance genetic diversity and adaptation potential. Therefore, scenarios that increase the chances of offspring inheriting a beneficial trait (natural selection) or that prevent passing of deleterious mutations (inbreeding leading to harm) show why conjugation (and thus genetic recombination) is advantageous for a population, particularly in new environments. However, it's important to note that crossing over does not occur during prophase II of meiosis.
Additionally, a population that includes individuals capable of conjugation through which recombination occurs would be more successful due to the introduction of new gene combinations, which may be advantageous. Without recombination, the genetic variability within a population would be limited, preventing effective adaptation and possibly leading to an increased risk of extinction.