In this case the daughter still has only a 50% chance of being colour defective. Blue colour blindness is far less common, being present in just 5% of all colour blindness sufferers. The genes affected are equal in both sexes.
The cheapest days to fly are usually Tuesday, Wednesday and Saturday. While your information may be only anecdotal evidence, it probably confirms what FareCompare.com's careful study of airline supply and demand confirmed in a 2011 study of U.S. carriers.
Summary. 1  For domestic and international trips, the cheapest day to depart is Wednesday and the worst day is Sunday. 2  You can save about $40 on domestic trips and $60 on international trips by leaving on the cheapest day as opposed to the most expensive day.