In an organism, a cross was made between females expressing three X-linked recessive traits: (a) green eyes, (b) blue body, and (c) long hair (abc/abc), and wild-type (+ + +/Y) 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 following results:
aabbcc 300
+a+b+c 294
+abbcc 142
aa+b+c 164
aa+bcc 40
+abb+c 36
aabb+c 13
+a+bcc 11
1. Determine the linear sequence of these three genes.
2. What is the map distance between these genes?
3. Calculate the interference value and explain it.