In which animal do haploid cells divide mitotically to produce gametes ?

The correct answer is Male honeybees.

Explanation:

1. Haplodiploidy in honeybees
Honeybees (genus Apis) have a haplodiploid sex‑determination system. Females (workers and queens) develop from fertilized eggs and are diploid (2n). Males, called drones, develop from unfertilized eggs and are therefore haploid (n).

2. Formation of male haploid cells
When an unfertilized egg (which contains a single set of chromosomes) begins development, it gives rise to a haploid embryo. All somatic cells of this embryo, including the cells that will become the testes, are haploid.

3. Mitotic division to produce sperm
In most diploid organisms, gametes are produced by meiosis, which halves the chromosome number. In male honeybees, however, the germ cells are already haploid, so they do not need to halve their chromosome complement. Instead, they undergo ordinary mitotic divisions to increase the number of haploid sperm cells. Each division copies the single set of chromosomes and partitions them into two identical haploid daughter cells.

4. Why other options are incorrect
• Male frogs, grasshoppers, and earthworms are diploid organisms. Their sperm are produced by meiosis, not by mitosis of haploid cells.
• Only in haplodiploid systems (e.g., honeybees, some wasps, and ants) are males haploid from the start, allowing mitotic sperm production.

Thus, haploid cells divide mitotically to produce gametes specifically in male honeybees.