NCEA Level 3 Biology – Speciation (AS91605) Practice Exam

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How does behavioral isolation contribute to speciation?

It prevents interbreeding due to mating behavior differences

Behavioral isolation is a key mechanism in the process of speciation because it occurs when differences in mating behaviors prevent individuals from different species from interbreeding. This can include variations in courtship rituals, mating calls, pheromone releases, or other behaviors that are critical for attracting mates. When these mating behaviors diverge, even if the species live in the same geographical area, they become less likely to mate with one another, effectively reducing gene flow between the populations. This reduction in gene flow can lead to the accumulation of genetic differences over time, eventually resulting in the emergence of distinct species. Thus, behavioral isolation is fundamental to the process of speciation by ensuring that reproductive barriers are maintained, allowing evolutionary processes to operate distinctively within each species.

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It promotes gene flow between different species

It increases genetic variation within a species

It allows for environmental adaptation of species

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