______ used the frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes.

Options

A. Morgan
B. Suttonn
C. A. Strutevant
D. Henking

Answer

**Step-by-Step Solution:**

1. **Understanding Recombination Frequency**: Recombination frequency refers to the likelihood that two genes located on the same chromosome will be separated during meiosis due to crossing over. This frequency can be used to infer the physical distance between the genes on the chromosome.

2. **Identifying the Scientist**: The question asks for the name of the scientist who utilized recombination frequency to measure the distance between genes. This concept is crucial in genetics for mapping the locations of genes on chromosomes.

3. **Historical Context**: In the early 20th century, geneticists were beginning to understand the structure of chromosomes and the role of genes. Alfred Sturtevant, a student of Thomas Hunt Morgan, was pivotal in applying these concepts to create the first genetic maps.

4. **Contribution of Alfred Sturtevant**: In 1913, Alfred Sturtevant developed a method to create chromosomal maps based on the frequency of recombination between gene pairs. He demonstrated that genes that are closer together on a chromosome have a lower recombination frequency, while those that are farther apart have a higher recombination frequency.

5. **Conclusion**: Therefore, the scientist who used the frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes is Alfred Sturtevant.

**Final Answer**: Alfred Sturtevant

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