Instructions: Given a scientific passage and an answer, generate a question for the given answer.
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
Output:
In humans, a zygote has how many chromosomes?