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

Example Input: Passage: Zinc reacting with hydrochloric acid produces bubbles of hydrogen gas. Answer: hydrogen
Example Output: Zinc reacting with hydrochloric acid produces bubbles of which gas?

Example Input: Passage: In sexually reproducing organisms, parents pass a copy of each type of chromosome to their offspring by producing gametes. When gametes are fertilized and form offspring, each has a unique combination of chromosomes and genes from both parents. The inherited gene combination determines the characteristics of the offspring. Answer: chromosome
Example Output: In sexually reproducing organisms, parents pass a copy of each type of what to their offspring by producing gametes?

Example Input: Passage: Upon fertilization a diploid zygote is formed. In humans, a zygote has 46 chromosomes, 23 inherited from each parent. The gametes, sperm and eggs, are haploid cells, with 23 chromosomes each. Answer: 46
Example Output:
In humans, a zygote has how many chromosomes?