The higher organisms and plants have both somatic and sex cells. Somatic cells present in diploid (2n) condition, whereas sex cells present in haploid condition (n). Thus, each somatic cell has a pair of genes, whereas sex cells have a single gene.
In humans, the gene BAPX1 (bagpipe homeobox homolog 1) is present in the chromosome 4. It expresses a transcription factor that plays a major part in the skeletal development. The figure 1-13 shows, two dots that means it is a diploid cell. Gametes are only haploid and hence possess a single set of chromosomes. If it is a gamete is should possess single dot in spite of two.
Hence, the given cell is somatic not a gamete.