The timetable of Drosophila development, from egg to adult, is summarized in Figure 21-24. The period of embryonic development begins at fertilization and takes about a day, at the end of which the embryo hatches out of the egg shell to become a larva.
How long does embryonic development before 1st instar larva hatches take in Drosophila melanogaster?
Just before the embryo hatches as the first instar larva at 22–24 hours, you will be able to see air-filled tracheae and other internal organs. You can use the staging series shown in Table 8.1 to stage your embryos; it is one of the more widely used series for Drosophila embryonic development.
What is the average generation time for Drosophila?
The generation time is roughly 10 d from fertilized egg to eclosed adult, and the maximum life span ranges from 60 to 80 d depending on the culture conditions. Drosophila is a holometabolous insect, and its life cycle can be divided into four stages: embryo, larva, pupa, and adult (Fig.
Is caudal a gap gene?
Gap genes constitute the first layer of the Drosophila segmentation gene hierarchy, downstream of maternal gradients such as that of Caudal (Cad).
What is the difference between a Parasegment and segment in Drosophila development?
What is the difference between a parasegment and segment in Drosophila development? … Segments correspond to the anatomical divisions seen in larvae and adults, whereas parasegments are subdivisions of the embryo that correspond to regions or domains of gene expression.
How can you tell if a Drosophila is male or female?
Male Drosophila are generally smaller than their female counterparts, and have a darker abdomen. The posterior segments of the Drosophila female are only pigmented in their posterior halves, whereas these segments are almost completely pigmented in the males.
At what temperature will fruit flies die?
Scientists have found that at 60°F, the lifespan of fruit flies decreases. When the temperatures fall below 53°F, these flies stop developing entirely. Still, adult fruit flies have the ability to “overwinter” when conditions get too extreme for them.
Which type of egg is found in Drosophila?
Each Drosophila egg arises from a multicellular structure within the ovary called an egg chamber (or follicle). The egg chamber itself consists of an internal cluster of germ cells comprised of 15 nurse cells and one posteriorly localized oocyte, surrounded by an epithelial monolayer of somatic follicle cells (Fig.
Are gap genes Morphogens?
The transition from an embryo characterized by gradients of morphogens to an embryo with distinct units is accomplished by the products of the gap genes. The gap genes are activated or repressed by the maternal effect genes, and they divide the embryo into broad regions, each containing several parasegment primordia.
What are Homeotic mutations?
A homeotic mutation mixes up body parts, so that a fly grows a leg on its head, antennae on its mouth, or sports a double set of wings.