Ap biology lab 7 genetics of drosophila lab report

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Ap biology lab 7 genetics of drosophila lab report

Drosophila has a small number of chromosomes, four pairs. They are easily located in the large salivary glands. The Drosophila can be obtained from many places. Research of Drosophilae has led to a lot of knowledge about many of its genes.

Many factors combine to affect the length of the Drosophila life cycle. Temperature affects the life cycle the most. At room temperature the average life cycle of the Drosophila is about 12 days. Eggs of the Drosophila are small, oval shaped, and have two filaments at one end. They are usually laid on the surface of the culture medium, and with practice, can be seen with the naked eye.

After one day the eggs hatch into the larva. The larval stage of the Drosophila eats all the time. Larvae tunnel into the culture medium when they eat.

Ap biology lab 7 genetics of drosophila lab report

The larva will shed its skin as it increases in size. 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. 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. They are fragile and light in color and their wings are not fully expanded.

They get darker in about an hour. They live about a month and then die. A female refrains from mating for about 12 days after she emerges from the pupal case. 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.

The experiment will take several weeks. You will be assigned Drosophila with well-defined mutant traits by your teacher. You will keep a close record of what happens as each of these flies mate and pass there traits off to their offspring over a few generations.

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There are three types of crosses that are studied in this lab. 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. In a sex-linked cross the mode of inheritance is determined when the mutant characteristic is associated with the X chromosome.

Hypothesis In the sex linked cross of Drosophila Melanogaster, a phenotypic ratio of 1: Materials The materials used in this lab are as follows: Methods Begin by obtaining a vial of wild type flies.

Practice immobilizing and sexing these flies. Make sure to examine the flies and determine the characteristics of their eyes, wings, bristles, and antennae.

Next, these are the steps for immobilizing the flies. Hold the vial containing the flies at an angle and place it in a refrigerator for several minutes. When the flies are immobilized, place them into a small plastic Petri dish.

Then place the Petri dish on top of the icepack in order to maintain the cool temperature necessary to keep flies immobilized.

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Use the dissecting microscope to view the flies. Make sure to top the petri dish on when viewing the flies.Genetics of Skin Cancer includes information about genes and hereditary syndromes associated with basal cell, squamous cell, and melanoma skin cancer.

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Revisions? Suggestions? Mary Chitty MSLS [email protected] Last revised October 25, Genetics of. Drosophila Lab Report Victor Martin April 14, Fourth Block AP Biology INTRODUCTION Genetics is a topic that has been studied for hundreds of years.5/5(3). Name: _____ AP Biology – Lab 11 Page 1 of 8 LAB 11 – Drosophila Genetics Introduction: Drosophila melanogaster, the fruit fly, is an excellent organism for genetics studies because it.

Ap biology lab 7 genetics of drosophila lab report

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AP Lab 7: Genetics of Drosophila Lab Report - Allysha's e-Portfolio