Final answer:
The choice that is NOT a disadvantage of sexual reproduction is 'Sexual reproduction reduces linkage disequilibrium' because this phenomenon actually supports the creation of genetic diversity, which is a significant advantage of sexual reproduction over asexual reproduction.
Step-by-step explanation:
The question at hand revolves around the potential disadvantages of sexual reproduction, and which of the listed choices is NOT one of those disadvantages. Among the potential disadvantages are the energetic expense of finding a mate, increased risk of predation, and the possibility that copulation may not result in offspring. However, the answer choice that mentions 'sexual reproduction reduces linkage disequilibrium' is not a disadvantage; in fact, it is one of the benefits of sexual reproduction because it increases genetic variation within a population.
Sexual reproduction results in greater genetic diversity, which can be advantageous in changing environments. This variation arises from the combination of genes from two parents, leading to offspring that are genetically distinct. This genetic diversity can help populations adapt to new conditions and resist diseases more effectively than asexual reproduction, where offspring are genetic clones of a single parent.
Therefore, answer 4) 'Sexual reproduction reduces linkage disequilibrium' is NOT a disadvantage of sexual reproduction but rather highlights a key advantage: the promotion of genetic variation and adaptability.