Discussion:
Genotypes, Phenotypes, and Karyotypes
The common fruit fly, Drosophila melanogaster, has been the subject of genetic study for over 100 years. In fruit flies, curly wings are dominant to straight wings.
1. How would you designate the genotype of a homozygous curly-winged fly?
2. How would you designate the genotype of a straight-winged fly?
3. What is the phenotype of the heterozygous fly?
4. What is the result of a cross of a heterozygous curly-winged fly to a straight-winged fly (include both genotype and phenotype with fractions of each)?
5. What is the result of a cross between two heterozygous flies (include both genotype and phenotype with fractions of each)?
6. I crossed two flies and I forgot to write down their phenotypes or genotype. If the ½ of the progeny have curly wings and ½ have straight wings, what are the genotypes and phenotypes of the two parents? (3 points)
7. Karyotyping assignment https://www.biology.arizona.edu/Human_Bio/activities/karyotyping/karyotyping.html.
Answer questions A1, A2, B1, B2, C1, and C2.