Like the eggs of other insects, but unlike vertebrates, it begins its development in an unusual way: a series of nuclear divisions without cell division creates a syncytium. The early nuclear divisions are synchronous and extremely rapid, occurring about every 8 minutes.
What is syncytium in Drosophila?
Abstract. In early development, Drosophila melanogaster embryos form a syncytium, i.e., multiplying nuclei are not yet separated by cell membranes, but are interconnected by cytoskeletal polymer networks consisting of actin and microtubules.
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.
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.
What are Denticle belts?
Denticles are hook-like structures produced by ventral epidermal cells during late embryogenesis (Fig. 1A). … Each belt is composed of six rows of cells, where each row produces a denticle of specific size, shape and polarity (Fig. 1B,C).
Who is responsible to produce different regions of egg in Drosophila?
The anterior-posterior polarity of the embryo, larva, and adult has its origin in the anterior-posterior polarity of the egg (Figure 9.8). The maternal effect genes expressed in the mother’s ovaries produce messenger RNAs that are placed in different regions of the egg.
What is the life cycle of Drosophila?
The Drosophila life cycle is divided into four stages: embryo, larva, pupa, and adult. The time length of the stages is approximate and is shown in hours for embryos and days for larvae and pupae.
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).
How do you tell if a fly is male or female?
The most simple characteristic to use to differentiate the two is to look at the genitalia of the flies. Males have dark, rounded genitalia at the tip of their abdomen, whereas females have light, pointed genitalia.