To solve this problem, we need to identify who first used the frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes to map their position on the chromosome.$\newline$Let's analyze the options:$\newline \bullet$Option 1: Thomas Hunt Morgan - He was a pioneering geneticist who discovered the role of chromosomes in heredity, but he did not develop the concept of using recombination frequency for gene mapping.$\newline \bullet$Option 2: Sutton and Boveri - They are known for the chromosome theory of inheritance, which linked chromosomes to Mendelian inheritance, but not for gene mapping using recombination frequencies.$\newline \bullet$Option 3: Alfred Sturtevant - He was a student of Thomas Hunt Morgan and was the first to use recombination frequencies to create a genetic map of a chromosome.$\newline \bullet$Option 4: Henking - He is known for discovering the X chromosome, but not for gene mapping.$\newline$Therefore, the correct answer is Option 3: Alfred Sturtevant.