Final answer:
The term 'diploid' does not belong with 'gamete', 'germ cell', 'egg', or '23 for humans' because it refers to cells with two sets of chromosomes, whereas the other terms relate to the haploid condition with one set of chromosomes.
Step-by-step explanation:
The term that does not belong among 'gamete', 'germ cell', 'diploid', 'egg', or '23 for humans' is diploid. Gametes (sperm and egg), germ cells, and the number 23 in the context of human chromosomes are all related to the haploid state of cells, which contain one set of chromosomes.
In humans, gametes have one set of 23 chromosomes. In contrast, diploid refers to cells that have two complete sets of chromosomes. Normal human cells are diploid and contain 46 chromosomes, arranged in 23 pairs. Thus, 'diploid' does not correlate with the haploid nature of the other terms listed.