Q: Given a scientific passage and an answer, generate a question for the given answer.
Passage: Early land plants also evolved a dominant sporophyte generation. Sporophytes are diploid, so they have two copies of each gene. This gives them a "back-up" copy in case of mutation. This was important for coping with the strong solar radiation and higher risk of mutations on land. Answer: organism has two copies of each gene
A:
What does it mean to be a diploid organism?