Hydra, a freshwater worm-like animal related to corals, has

Last updated: 7/4/2022

Hydra, a freshwater worm-like animal related to corals, has two HOX genes. Humans have 39 HOX genes. Which of the following best explains the difference in HOX gene number between hydra and humans? A. Gene flow B. Gene loss C. Genetic drift D. Gene duplication