What mutation in fruit flies did Thomas Morgan observe?
white eye mutation
To explain the white eye mutation, Morgan bred the mutant fly and observed how the mutation was inherited throughout successive generations.
What are some common mutations in fruit flies?
Some common mutations seen in fruit flies include wing structure and eye color variations. Mutant wings may be short or backward. Fruit flies are known for their red eyes, although mutations cause certain specimens to have golden or white eyes. Mutations also sometimes result in eyeless flies.
What is the mechanism of Drosophila wing expansion?
Expansion of the pupal wing to form the adult wing. At around 46 h APF, the wing begins to expand in size and fold within the pupal cuticle, which it has now physically detached from by the process of apolysis (Fristrom et al. 1993).
What mutant is responsible for curly wings of Drosophila?
Notice the curled wings of these flies. 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.
What is Morgan theory?
By painstakingly examining thousands upon thousands of flies with a microscope and a magnifying glass, Morgan and his colleagues confirmed the chromosomal theory of inheritance: that genes are located on chromosomes like beads on a string, and that some genes are linked (meaning they are on the same chromosome and …
Why TH Morgan Drosophila melanogaster in his genetic experiments?
Morgan’s fly lab (Figure 1) at Columbia University was already in the habit of breeding Drosophila so that the researchers there could observe the transmission of genetic traits through successive generations, so Morgan chose to do a simple breeding analysis to find out more about white eyes.
How many different alleles are seen in the wing series of Drosophila?
Since there are three different alleles, there are a total of six different genotypes at the human ABO genetic locus.
What kind of wings do fruit flies have?
Wild type fruit flies have straight, flat wings. Based on the fact that this is a very common insect wing shape, you can determine that this is an ideal wing shape for flying. Sometimes though, fruit flies are born with extremely short wings.
How many different alleles are seen in Wing series of Drosophila?
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. Males do not show meiotic recombination, facilitating genetic studies.
What kind of mutation is curly CyO )?
Curly mutations occur within duox In the course of genetically following a loss-of-function mutation in the gene duox, duox KG07745, using the standard Drosophila genetic tool Curly of Oster (CyO) balancer, we noticed that we were unable to recover progeny containing both duox KG07745 and CyO.
Why TH Morgan used Drosophila melanogaster in his genetic experiments?
T. H. Morgan selected Drosophila melanogaster to study sex-linked genes in his lab experiment due to the following reasons: (ii) Sex-linked traits such as red eye colour and white eye colour are found only in Drosophila ​melanogaster, where white eye colour in males is a sex-linked recessive trait.