When backcross
populations are considered as a group, I predictably
increased dramatically during advanced backcrossing
[i.e., among any backcross pair (BC2P2 versus
BC3P2)] to as high as 0.91, suggesting that relatively
few alleles contributed significantly to the amongpopulation
genetic variation; for example, the lowest
I (0.320) was detected between backcross populations
derived from WI 7012A (C. hytivus derived) and WI
7023A (C. sativus derived), where a gradual increase
in genetic similarity was detected over successive
backcrossing and selfing generations [e.g., 0.49
(BC1P2 NSel versus WI 7012A) to 0.59 (BC3P2 Sel
versus WI 7012A)].