Question Statement:
In a genetic cross between the genotypes WWXX and wwxx, the following phenotypic
distributions were observed among the F2 progeny: WX, 562; wx, 158; Wx, 38; and wX, 42.
Likewise, a cross between XXYY and xxyy yielded the following results: XY, 675; xy, 175; Xy,
72; and xY, 78. Similarly, a cross between WWYY and wwyy yielded: WY, 292; wy, 88; Wy, 12;
and wY, 8. In all the genotypes, capital letters denote the dominant allele. Assume that the F1
progeny were self-fertilized in all three crosses. Also, double cross-over does not occur in this
species. Which of the following is correct?
Options:
- (A) Relative position: W-X-Y Distances: W-X = 5 map units, X-Y = 17 map units
- (B) Relative position: X-Y-W Distances: X-Y = 15 map units, Y-W = 11 map units
- (C) Relative position: Y-W-X Distances: Y-W = 5 map units, W-X = 11 map units
- (D) Relative position: X-W-Y Distances: X-W = 5 map units, W-Y = 10 map units