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.
In general, airlines offer their cheapest flights during business hours, when value-minded business travelers are booking flights. The best single time and day to book a flight is 3 p.m. Eastern time on Tuesday, according to Rick Seaney, CEO of FareCompare. Early morning or late-night flights are less popular, and therefore cheaper. Purchasing a so-called red-eye flight may also save you money.