Introduction Drosophila Melanogaster, the fruit fly, is a great organism for genetic use because it has simple food requirements, occupies little space, is hardy, completes its life cycle in 12 days, makes a large number of offspring, can be knocked out easily, and it has many types of hereditary variations that can be seen with low power microscopes.Drosophila has a small number of chromosomes, four pairs.
After another week has passed, remove the F1 flies and put them in the morgue.
The F2 generation are the eggs and larvae in the vial. Once again, after another week has passed remove the F2 flies and record their sex and characteristics and place the results in Table 7.2. In the F1 generation the males had white eyes and the females had red eyes.
In the last of the three larval stages, the cells of the salivary glands contain giant chromosomes that can be seen under low power in a microscope. Before a larva becomes a pupa it climbs the side of the container.
The last larval covering then becomes harder and darker, forming the pupal case.
Then place the six pairs of these flies in a new vial and place the remaining flies in the morgue.
Label the new vial F1, and tell the cross, date and your name.Recording a greater number of F2 flies will make your results more accurate. In order to analyze your data you will first have to be able to be able to complete Chi-Square Analysis. In the F2 generation the males and females could have had either red or white eyes. Write a hypothesis which describes the mode of inheritance of the trait you studied.This is your null hypothesis ( as described in the Statistical Analysis Section). Referring to the critical values chart what is the probability value for these data?They are fragile and light in color and their wings are not fully expanded. After she mates her receptacles contain large amounts of sperm and she lays her eggs.Make sure that the first flies you use are virgins. You will be assigned Drosophila with well-defined mutant traits by your teacher.In monohybrid crosses the mode of inheritance is determined when a single contrasting pair of characteristics is involved.In a dihybrid cross the mode of inheritance is determined when the two pairs of contrasting of characteristics are considered simultaneously.Since the 1960s, the zebrafish (Danio rerio) has become increasingly important to scientific research.It has many characteristics that make it a valuable model for studying human genetics and disease.Through this case the later stages of metamorphosis to an adult fly can be seen.In particular, the eyes, the wings, and the legs become visible. When metamorphosis is over, the adult fly emerges form the pupal case. A female refrains from mating for about 12 days after she emerges from the pupal case.