Question

Generate a genetic map. Show the correct relative order of the three genes under study (w, y, and cv), and show the map distances between the pairs of genes (i.e the distance between the first and the middle gene, and the distance between the middle and the last gene).

Parental cross: (y- , w-, cv+/y- , w- , cv+) females X (y+, w+, cv- /Y) males

F2 Phenotypes:

Yellow, White, Crossveined (parental) — y-, w-, cv+ 606
Brown, Red, Crossveinless) (parental) — y+, w+, cv- 782
Yellow, White, Crossveinless — y-, w-, cv- 59
Brown, Red, Crossveined — y+, w+, cv+ 159
Yellow, Red, Crossveinless — y-, w+, cv-     21
Brown, White, Crossveined — y+, w-, cv+ 7
Yellow, Red, Crossveined — y-, w+, cv+    1
Brown, White, Crossveinless — y+, w-, cv- 0
Total # of F2 flies counted: 1635

Answer 1