At 15:00 -0400 2006-04-14, Andrew Plotkin wrote:
That greatly increases the risk of a genetic problem, by reinforcing a negative trait in the X chromosome.
Most such negative traits would have already made themselves evident in the male DNA donor. (Haemophilia is the traditional example.)
-- Daniel W. Johnson panoptes@xxxxxxxxxx http://members.iquest.net/~panoptes/ 039 53 36 N / 086 11 55 W