Ensayo Sobre La Contaminacion
Páginas: 3 (568 palabras)
Publicado: 5 de marzo de 2013
Life cycle of the drosophils flies.
Like many species, female fruit flies produce eggs and males produce sperm. When the egg and sperm unite, a new individual develops. In fruit flies, sperm isdeposited from the male fruit fly into the female fruit fly. The female stores sperm inside of her. The eggs are fertilized when they pass through the oviduct on their way to being deposited on a foodsource.
The life cycle of the fruit fly begins after the male and female courtship and mating. Males congregate in groups near potential egg-laying areas to court females. After mating, the femalefinds decaying fruit, plant, fungal or organic material on which to lay eggs. Females lay single to multiple eggs depending upon their species, habitat and environmental conditions. The eggs are laidnear yeast and bacteria growing on the decaying materials. The yeast and bacteria are the food for the developing larvae.
An embryo begins to develop inside the egg immediately after it has beenlaid. The embryo develops into a first stage (first "instar") larva in one to three days. The larva emerges from the egg casing and begins feeding immediately.
After emerging from the egg, the firstinstar larva feeds continuously for one or more days depending on species and environmental conditions. The rapid growth of the larva causes it to outgrow its skin. At this time, it molts into a secondinstar. The second instar eats for three to five days until it is time to molt into a third, and final, larval instar. After feeding for five to ten days, the third instar pupates.
The thirdinstar larva becomes stationary and changes into a pupa. The pupa is a resting stage that allows metamorphosis to occur within the pupal case. During this stage, the pupa develops into a three-segmentedadult with compound eyes, legs and wings. The time spent as a pupa can vary with Drosophila melanogaster requiring five days to metamorphose from a pupa to an adult.
The adult fruit fly emerges...
Like many species, female fruit flies produce eggs and males produce sperm. When the egg and sperm unite, a new individual develops. In fruit flies, sperm isdeposited from the male fruit fly into the female fruit fly. The female stores sperm inside of her. The eggs are fertilized when they pass through the oviduct on their way to being deposited on a foodsource.
The life cycle of the fruit fly begins after the male and female courtship and mating. Males congregate in groups near potential egg-laying areas to court females. After mating, the femalefinds decaying fruit, plant, fungal or organic material on which to lay eggs. Females lay single to multiple eggs depending upon their species, habitat and environmental conditions. The eggs are laidnear yeast and bacteria growing on the decaying materials. The yeast and bacteria are the food for the developing larvae.
An embryo begins to develop inside the egg immediately after it has beenlaid. The embryo develops into a first stage (first "instar") larva in one to three days. The larva emerges from the egg casing and begins feeding immediately.
After emerging from the egg, the firstinstar larva feeds continuously for one or more days depending on species and environmental conditions. The rapid growth of the larva causes it to outgrow its skin. At this time, it molts into a secondinstar. The second instar eats for three to five days until it is time to molt into a third, and final, larval instar. After feeding for five to ten days, the third instar pupates.
The thirdinstar larva becomes stationary and changes into a pupa. The pupa is a resting stage that allows metamorphosis to occur within the pupal case. During this stage, the pupa develops into a three-segmentedadult with compound eyes, legs and wings. The time spent as a pupa can vary with Drosophila melanogaster requiring five days to metamorphose from a pupa to an adult.
The adult fruit fly emerges...
Leer documento completo
Regístrate para leer el documento completo.