Answer:
D..random mating..random mixing of gametes cannot occur
A population has been constituted of individuals of the same species. "If individuals tend to mate within a subset of the population, there is no random mating." Thus, option D is correct.
Random mating has been the reproduction and fertilization between the species regardless of the social, physical, and genetic barriers. It is also referred to as Panmixia which makes the species a potential partner.
From the evolution point of view, the reproductively active species can mate with the species that do not take their genotype into their account. But if the species populates within the same population then there is no random mating as the frequency remains the same.
Therefore, in option D. there will be no random mating in the population.
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