1. Drosophila melanogaster Life cycle and introduction to genetics

2. Drosophila as model species Studied for ~100 years Short life cycle Many available mutants Studied for ~100 years Short life cycle Many available mutants

3. Life cycle 10 days @ 25° C 20 days @ 18° C Stages –Embryogenesis (Egg) –first instar larvae –second instar larvae –third instar larvae –pupal stage –Adult Fly

4. Sexing Drosophila Females larger than males Males- dorsal posterior plates are black Females- only last plate is dark

5. Sexing Cont. Males-visible genitals Females not as visible Males- sex combs Females- lack sex combs

6. Sex Cont.

7. Genetics