The diploid number of a cell is the count of the number of chromosomes in that cell. In contrast, the haploid number is half the number of chromosomes, or the set of chromosomes donated by one parent. The diploid number represents the total number of chromosomes donated by both parents.

Cells contributing to the structure of the mosquito's stomach are non-sex cells, and are therefore diploid, so the number of chromosomes would be 6.

Sperm cells, being gametes, are haploid, so the number of chromosomes present in a sperm cell is 3.

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