Discussion:
Determine the linear sequence of these three genes
In Drosophila, a cross was made between females expressing the three X-linked recessive traits: scute (sc) bristles, sable (s) body and vermillion (v) eyes, and wild-type (+) males. In the F1, all females were wild-type, while all males expressed all three recessive traits. The cross was carried to the F2 generation and 1000 offspring were counted with the results shown below.
Offspring #
sc s v 314
+ + + 280
+ s v 150
sc + + 156
sc + v 46
+ s + 30
sc s + 10
+ + v 14
1. Determine the linear sequence of these three genes.
2. What is the map distance between these genes?
3. Is there evidence of interference? If so, calculate it.