Question

Consider four genes G, H, I, and J. The physical distance between G and H is 100,000 bases, and the distance between I and J is also 100,000 bases. However, the map distance between G and H is 10 cm, while the map distance between I and J is only 1 cm. Which of the following may explain this difference? (Select all correct answers) a. Gene interference b. Genetic recombination c. Different rates of mutation d. Inversion in the chromosome

Answer 1

Genetic recombination can explain the difference in map distances between G and H and I and J.

Step-by-step explanation:

The difference in map distance between G and H (10 cm) and I and J (1 cm) can be explained by genetic recombination. Genetic recombination occurs during meiosis when homologous chromosomes exchange genetic material. The frequency of recombination is related to the physical distance between genes, with genes that are farther apart having a higher chance of recombination.

In this case, the higher map distance between G and H suggests that there is a greater physical distance between these genes, allowing for more opportunities for recombination to occur. Conversely, the lower map distance between I and J suggests that these genes are physically closer together, resulting in fewer opportunities for recombination.

Therefore, genetic recombination can explain the difference in map distances between G and H and I and J.