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.
Mr Schulze said that there was no clear single day to find the cheapest deal for all fights. However, when flying to most areas of the world, the cheapest tickets were sold on a Saturday or Sunday. He added that the reason Fridays are so expensive is because airlines launch price hikes then and have already run out of cheap seats.