Often different genes can interact in a way that influences the same trait. In the Blue-eyed Mary (Omphalodes verna), for example, there exists a gene with alleles that determine the color of flowers: blue or magenta. Another gene, however, controls whether the flowers have color at all or are white.
The regular price of buying miles from American is about 3.17 cents per mile ($29.50 per 1,000 miles plus a 7.5% Federal Excise Tax) â before a $30 Processing Charge per purchase â but with the maximum bonus offer, itâll actually drop your price down to just 2.02 cents per mile!
1 AAdvantage miles at AmericanAirlines cost US 2.75Â¢ per mile for purchases of 1,000 to 5,000 miles, and 2.5Â¢ for purchases of 6,000 to 40,000. Current AAdvantage members may buy up to 40,000 miles a year for their own through the buyAAMiles program or purchase miles as a gift for other AAdvantage members for through the giftAAmiles program. 2  Members may transfer up to 60,000 miles out of their account per calendar year.