Trihybrid Cross
4. Genetic Mapping and Linkage / Trihybrid Cross / Problem 4
In Drosophila, sepia eyes (se), curled wings (cu) and ebony body (e) are encoded by recessive genes found on chromosome 3. A researcher crosses se cu e/ + + + females with se cu e/ se cu e males and obtains the following progeny data:
![Table showing genotypes and offspring numbers from a Drosophila trihybrid cross.](https://lightcat-files.s3.amazonaws.com/problem_images/ef52956089c6b06b-1679583628314.jpg)
Determine the number of double crossovers.
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