Given a scientific passage and an answer, generate a question for the given answer.

[EX Q]: Passage: Sensory organs such as the eyes contain cells called sensory receptors that respond to particular sensory stimuli. Answer: sensory receptors
[EX A]: Sensory organs that respond to particular sensory stimuli contain cells called what?

[EX Q]: Passage: The haploid gametophyte produces the gametes, or sperm and egg, by mitosis. Remember, gametes are haploid, having one set of chromosomes. Answer: mitosis
[EX A]: By what process does the haploid gametophyte produce the gametes?

[EX Q]: Passage: Chromosomal Alterations. Chromosomal alterations are major changes in the genetic material. Answer: chromosomal alterations
[EX A]:
What term is used to describe major changes in the genetic material?