Consider two genes that are independent, the A gene and the B gene. Each gene has two alleles (A gene: A1 and A2, B gene: B1 and B2). The frequency of A1 allele at the A gene is 0.85 and the frequency of the B2 allele at the B gene is 0.24. What is the probability of an individual in a randomly mating population of having A1B2|A2B1 as their genotype

The probability of an individual in a randomly mating population of having the genotype A1B2|A2B1 = 0.658 = 65.8% ≅ 66%  

Explanation:  

Due to technical problems, you will find the complete explanation in the attached file

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.