Final answer:
The triploid with 30 total chromosomes will have the most trouble producing functional gametes due to the difficulty in pairing homologous chromosomes evenly during meiosis.
Step-by-step explanation:
The individual who will have the most trouble in producing functional gametes during meiosis is the triploid with 30 total chromosomes. This difficulty arises because gametogenesis requires homologous chromosomes to pair up and segregate evenly during meiosis, a process conducive to euploidy organisms like diploids and tetraploids with even sets of chromosomes.
A triploid organism, having an odd number of chromosome sets, faces complications during this pairing process, potentially leading to nonviable gametes or aneuploidy conditions such as monosomy or trisomy. In contrast, diploid and tetraploid organisms typically can align their homologous chromosomes more easily, with tetraploids having a greater number of potential combinations that contribute to genetic diversity, but without the issues seen in triploids.