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.
Best day to shop: The best time to book a U.S. flight is usually Tuesday at about 3 p.m. eastern time. Many airlines release weekly airfare sales in the early morning hours of Tuesday, and by mid-afternoon, competing airlines have matched sale prices.