The cells of parent algae have nuclei. Each offspring contains chloroplasts. Several offspring may be produced at once. Genetic material is contributed by two parent cells.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Spirogyra are green algae that can reproduce sexually. Which of the following features identifies reproduction in Spirogyra as sexual reproduction?
Possibilities:
- The cells of parent algae have nuclei.
- Each offspring contains chloroplasts.
- Several offspring may be produced at once.
- Genetic material is contributed by two parent cells.

Genetic material is contributed by two parent cells.