is a fruit fly, which is used in biological
research, particularly in genetics.
The scientific name
means “lover of dew”
which implies that this species requires moist environments to survive.
It belongs to the
therefore will mature through complete metamorphosis.
It is a 3 mm,
two-winged insect, with three body segments consisting of the head, thorax, and
abdomen and has three pairs of segmented legs.
It is a good model in Genetics because it
is small, can be easily cultivated in the laboratory, short life cycle, easy to keep large
quantities, and the entire genome has been sequenced.
of four pairs of chromosomes, three autosomal pairs, and two sex chromosomes.
Its life cycle goes through four stages: egg, larva, pupa, and adult. It takes about
twelve days to become fully mature (Figure 2).
At Day 0, the female fly lays its eggs.
Day 1, the eggs hatch and enter the first instar at Day 2. At Day 3, they reach the second
instar, which then enters the third instar at Day 5, which lasts for two days.
At Day 7,
pupal formation begins and at Day 11-12, the adult arises from the pupa shell, which is
known as eclosion.
After eclosion, females will become sexually mature within 8-10
has a simple behavior, as they are easily drawn to the
smell of any food source and will mate with any individual of the opposite sex.
sensitive to air currents, their eyes are sensitive to different light intensities, and
instinctively fly away when a shadow or movement is sensed.
have red eyes, a beige body color, their wings are full, round, and pass beyond the
abdomen, and have transverse black rings across their abdomen (Figure 1).