What are the two pigment pathways in Drosophila?

What are the two pigment pathways in Drosophila?

In the eyes of Drosophila, the pigments responsible for eye color are produced by two biochemical pathways: the ommochrome pathway producing a brown pigment, and the pteridine pathway first passing through a pale blue then yellow pigment stages producing a bright red (scarlet) pigment called drosopterin.

What is the eye colour of Drosophila?

The fruit fly Drosophila melanogaster possesses disproportionately large, often vividly colored eyes. These range in color from red to sepia to white and indicate a great deal about the fly’s genetic makeup. Some fruit flies bred in the wild have red eyes.

What is Ommochrome pathway?

The ommochrome pathway converts tryptophan into pigments with various colors ranging from yellow to red, or brown to black (29) (Fig. 3A), whereas pteridine pathway converts GTP into yellow, orange, or red pigments (30) (Fig. 3B). The ABC transporter White is common to both ommochrome and pteridine pathways (Figs.

What is the generic name of the pigments found in fly eyes?

There are two classes of pigments in the eye of Drosophila, brown pigments called ommochromes, which are the products of tryptophane metabolism, and red pigments called pteridines, which are the products of purine metabolism.

What is the dominant body colour in Drosophila?

Yellows mated with wild type gave either equal numbers of yellow and wild type or all yellows. From these data it appears that the factor for yellow is domi- nant and that flies homozygous for yellow are viable. So far as known to me this is the only dominant mutant body color in any species of Drosophila.

What causes brown eyes in fruit flies?

D. melanogaster has a red-brown eye color caused by the presence of two classes of pigments, pteridines (red) and ommochromes (brown).

What causes white eye 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.

What is the white gene in Drosophila?

The white (w +) gene in Drosophila, discovered in 1910 by Thomas Hunt Morgan16, encodes a subunit of an ATP-binding cassette (ABC) transporter, which loads up pigment granules and deposits the content to pigment cells in the compound eyes, ocelli, Malpighian tubules and testis17, 18.

What is the phenotypic ratio of red eyed Drosophila?

Surprisingly, this cross yielded a 1:1:1:1 ratio of red-eyed females to white-eyed females to red-eyed males to white-eyed males.

What is the genotypic ratio of white eyed Drosophila?

The expected ratio would be 3:1. The observed ratio as about 1 red-eyed for every white-eyed fly. This does not support the assumption that this is an autosomal monohybrid cross.

Why is paper chromatography of Drosophila melanogaster pteridine eye pigments inconclusive?

Paper chromatography of Drosophila melanogaster pteridine eye pigments requires more time than the usual two-hour classroom laboratory period affords. When paper chromatography of eye pigments is conducted within a single classroom laboratory period, the results are often inconclusive due to incomplete and inadequate migration of some pigments.

What is the biochemical pathway of pteridine eye pigment?

Biochemical Pathway of Pteridine Eye Pigments Colorless Compound 1 Colorless compound 2 Intermediate pigment Isoxanthopterin (Violet-blue) Intermediate pigment Sepiapterin (Yellow) Enzyme 1 Enzyme 2 Enzyme 3 drosopterin (red-orange) isosepiapterin (yellow)

What are the pigments in the eye of Drosophila?

There are two classes of pigments in the eye of Drosophila, brown pigments called ommochromes, which are the products of tryptophane metabolism, and red pigments called pteridines, which are the products of purine metabolism.

What are the two intermediate pigments that make up the colorless compound?

Colorless Compound 1 Colorless compound 2 Intermediate pigment Isoxanthopterin (Violet-blue) Intermediate pigment Sepiapterin (Yellow) Enzyme 1 Enzyme 2 Enzyme 3