Table of Contents
What is Drosophila wing disc?
Abstract. The Drosophila wing imaginal disc is a tissue of undifferentiated cells that are precursors of the wing and most of the notum of the adult fly. The wing disc first forms during embryogenesis from a cluster of ∼30 cells located in the second thoracic segment, which invaginate to form a sac-like structure.
What kind of eyes do Drosophila have?
The Drosophila compound eye contains approximately 700 (male) to 750 (female) unit eyes known as ‘ommatidia’; the adult structure is presented in Fig. 5.1. Each ommatidium consists of a core of eight photoreceptor neurons, capped by four non-neuronal cone cells and two primary pigment cells that together form an ‘iris.
Why does research on Drosophila eye is carried out?
The eye has been one of the most intensively studied organs in Drosophila. The wealth of knowledge about its development, as well as the reagents that have been developed, and the fact that the eye is dispensable for survival, also make the eye suitable for genetic interaction studies and genetic screens.
Is white-eyed Drosophila blind?
It carries the precursors of the red and brown eye color pigments, guanine and tryptophan, into the developing eyes during pupation. White-eyed flies are not blind; instead they are easily temporarily blinded by bright light at certain frequencies because they lack the protection provided by the red and brown pigments.
What is Drosophila bar eye?
One phenotype that has been analyzed in Drosophila with respect to duplications is bar eye. The eye of the fly is normally an elongated oval shape whereas the bar eye phenotype is much thinner. When the chromosomes of males with bar eye are analyzed, a duplication in region 16A of the chromosome is detected.
What causes white eyes in Drosophila?
The eye color gene is located on the X chromosome (one of the sex determining chromosomes of Drosophila). White eye color is recessive. When a red eyed male mates with white eyed females, their daughters will have red eyes, but their sons will have white eyes.
Why Drosophila is most suitable organism for genetic experiment?
Due to their small size and minimal requirements, many Drosophila can be raised and tested within a small laboratory which does not have access time, space or funding. Genetic factors also make this fly an ideal model organism. D. melanogaster only has four pairs of chromosomes compared to 23 pairs in humans.
Why is Drosophila used extensively for genetic studies?
Because it is a simple synthetic medium that can be cultivated in the laboratory, Drosophila has been utilised extensively for genetic studies. A single mating can result in a vast number of offspring files, which have a two-week life period.
Are imaginal discs necessary features of insect metamorphosis?
Imaginal disks are epithelial structures characteristic of insects that undergo complete metamorphosis. These epithelia originate during embryonic development from groups of ectodermal cells that grow during the larval stages to form the mature disk.
How many imaginal discs are there in Drosophila?
19 discs
The imaginal discs get their name since they are ‘disc’-shaped structures that will originate the imago. How many imaginal discs does a fly have? There are 19 discs in total: the epidermis of the head, thorax and limbs of the fly come from 9 bilateral pairs of discs and the genitalia come from a medial disc.
Which eye color is dominant in Drosophila?
red eye colour
In Drosophila, white eye colour is recessive X-linked trait while red eye colour is dominant. A white eyed female is crossed with red eyed male. The female offspring with red eye colour would be.
What is a bar eye?
In structural engineering and construction, an eyebar is a straight bar, usually of metal, with a hole (“eye”) at each end for fixing to other components. Eyebars are used in structures such as bridges, in settings in which only tension, and never compression, is applied.
What is bar locus in Drosophila?
Duplications of the Bar locus of Drosophila The eye of the fly is normally an elongated oval shape whereas the bar eye phenotype is much thinner. When the chromosomes of males with bar eye are analyzed, a duplication in region 16A of the chromosome is detected. Another mutant of the eye shape is the double bar eye.
Why did they use Drosophila as a model specimen?
The major benefit of using Drosophila is that there are also no ethical issues surrounding their use, which is common for mammal models such as monkeys. One of the main advantages is its short life cycle, allowing fora large quantity of flies to be produced within a short period.
What is the drosophilacompound eye?
The Drosophilacompound eye contains approximately 700 (male) to 750 (female) unit eyes known as ‘ommatidia’; the adult structure is presented in Fig. 5.1. Each ommatidium consists of a core of eight photoreceptor neurons, capped by four non-neuronal cone cells and two primary pigment cells that together form an ‘iris.’
What is the life cycle of Drosophila?
The Drosophila life cycle includes three larval stages that together span four days. For most of larval life the eye disk proliferates, broadly establishing the eye field and dividing it into dorsal and ventral regions. Cell-type differentiation begins midway through the final larval stage.
Is the adult Drosophila eye a model of precision or precision?
The adult Drosophila eye is a model of precision. Anterior is to the right. (A) The adult compound eye is composed of more than 700 precisely arranged ommatidia. This precision combines with the eye’s curvature to evenly
How many photoreceptor neurons in Drosophila?
Nor do we understand the mechanisms that limit the number of photoreceptor neurons specifically to eight in Drosophila. The Drosophilaeye presents a uniquely simple model for studying these small-scale issues of tissue patterning and remodeling yet these issues remain a challenge to the field. 2.4. Signaling from the peripodial membrane