The haplodiploid sex-determination system where all the males of the population are haploid and females are diploid, is seen in:

Honey bees

The correct answer is Option (2)- Honey bees

The information provided correctly describes the sex determination systems in different organisms:

1. Haplo-diploid sex determination in honey bees: In honey bees, the haplo-diploid sex determination system is used. Males (drones) are haploid, meaning they have half the number of chromosomes compared to females. Females are diploid.
2. Male heterogamety in Drosophila and grasshoppers: In some insects, such as Drosophila (fruit flies) and grasshoppers, the sex determination system is based on male heterogamety. In these species, males have two different sex chromosomes, while females have two identical sex chromosomes.
3. Female heterogamety in birds: In birds, the sex determination system is based on female heterogamety. Female birds have two different sex chromosomes, Z and W, while male birds have two identical sex chromosomes, ZZ.

These various sex determination systems demonstrate the diversity of mechanisms that have evolved in different species for determining the sex of individuals.