What causes variation in Drosophila eyes?
What causes variation in Drosophila eyes?
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.
Where on the chromosomes is the purple eye gene located?
A particular region on chromosome 15 plays a major role in eye color. Within this region, there are two genes located very close together: OCA2 and HERC2.
What causes scarlet eyes in Drosophila?
In the eyes of Drosophila, the pigments responsible for eye color are produced by two biochemical pathways: the onmochrome 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 eye color is dominant in Drosophila?
Red
The alleles for eye color and for body color are on the X chromosome of Drosophila, but not on the Y. Red eye color (w+) is dominant to white eye color (w), and tan body color (y+ ) is dominant to yellow body color (y).
What mutation causes brown eyes in fruit flies?
melanogaster has a red-brown eye color caused by the presence of two classes of pigments, pteridines (red) and ommochromes (brown). There are independent pathways for the synthesis of each (Reaume et al. 1991; Summers et al. 1982).
How many pairs of chromosomes are present in somatic cell of Drosophila?
It has only four pairs of chromosomes – three autosomes, and one pair of sex chromosomes.
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 is white eye mutation in Drosophila?
white, abbreviated w, was the first sex-linked mutation discovered, found in the fruit fly Drosophila melanogaster. In 1910 Thomas Hunt Morgan and Lilian Vaughan Morgan collected a single male white-eyed mutant from a population of Drosophila melanogaster fruit flies, which usually have dark brick red compound eyes.
Is white eye mutation in Drosophila pleiotropy?
The term pleiotropy is derived from the Greek word “pleio”, which means “many”, and “tropic”, which means “affecting”. Examples of pleiotropy: In Drosophila, the gene that controls white eye mutation is also responsible for depigmentation of body parts.
What is Drosophila mutation?
They have a defect in their “curly gene,” which is on the second chromosome. Having curled wings is a dominant mutation, which means that only one copy of the gene has to be altered to produce the defect. In fact, if both copies are mutated, the flies do not survive. Normal Fruit Flies.
What is the number of chromosomes in the gametes of Drosophila?
There are 4 chromosomes in its haploid gametes.
How many linkage groups are present in female Drosophila?
Fruit-fly Drosophila melanogaster has four linkage groups (4 pairs of chromosomes).
Where is the eyeless gene located in Drosophila melanogaster?
A mutation of the eyeless gene in Drosophila melanogaster changes the phenotype and is demonstrated to be located within intron 2 of the eyeless gene.
What is Drosophila melanogaster sepiapterin synthase?
Purification and properties of the enzymes from Drosophila melanogaster that catalyze the synthesis of sepiapterin from dihydroneopterin triphosphate. Krivi GG, et al. Biochem Genet, 1979 Apr. PMID 114165 Developmental changes of sepiapterin synthase activity associated with a variegated purple gene in Drosophila melanogaster.
Why are drosopholia melanogaster flies used for genetic study?
Drosopholia melanogaster flies are ideal for genetic study. This is due to the ability to observe mutation of the DNA through phenotypic manifestations. A mutation is an alteration in the DNA that may or may not alter gene expression within the organism containing the modified sequence.
